Happy number

Happy number - numbers with a certain property involving recursive summation. Article “Happy number” in English Wikipedia has 41 points for quality (as of July 1, 2026). The article contains 13 references and 16 sections.

In this language version of Wikipedia the article has the best quality. Also, this article is the most popular in that (English) language version.

Since the creation of article “Happy number”, its content was written by 224 registered users of English Wikipedia and edited by 756 registered Wikipedia users in all languages.

The article is cited 325 times in English Wikipedia and cited 2934 times in all languages.

The highest Authors Interest rank from 2001:

• Local (English): #8546 in January 2005
• Global: #3029 in December 2011

The highest popularity rank from 2008:

• Local (English): #14063 in April 2019
• Global: #30289 in April 2019

There are 28 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2026 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

#	Language	Quality grade	Quality score
1	English (en) Happy number		40.9916
2	German (de) Fröhliche Zahl		37.1673
3	Chinese (zh) 快樂數		30.5206
4	Catalan (ca) Nombre feliç		27.4427
5	French (fr) Nombre heureux		26.3297
6	Greek (el) Ευτυχής αριθμός		25.5018
7	Spanish (es) Número feliz		20.3988
8	Dutch (nl) Gelukkig getal		19.9762
9	Romanian (ro) Număr fericit		18.9342
10	Portuguese (pt) Número feliz		18.1796

More...

The following table shows the most popular language versions of the article.

The most popular language versions of the article "Happy number" in all the time

#	Language	Popularity award	Relative popularity
1	English (en) Happy number		2 156 194
2	Spanish (es) Número feliz		205 003
3	Italian (it) Numero felice		189 179
4	German (de) Fröhliche Zahl		125 178
5	French (fr) Nombre heureux		88 025
6	Vietnamese (vi) Số may mắn		79 879
7	Chinese (zh) 快樂數		78 752
8	Japanese (ja) ハッピー数		77 815
9	Russian (ru) Счастливое число (happy number)		73 262
10	Czech (cs) Šťastné číslo		64 535

More...

The following table shows the language versions of the article with the highest popularity in the last month.

The most popular language versions of the article "Happy number" in June 2026

#	Language	Popularity award	Relative popularity
1	English (en) Happy number		4 868
2	Japanese (ja) ハッピー数		488
3	Chinese (zh) 快樂數		481
4	Italian (it) Numero felice		301
5	German (de) Fröhliche Zahl		285
6	Russian (ru) Счастливое число (happy number)		253
7	Vietnamese (vi) Số may mắn		215
8	Spanish (es) Número feliz		208
9	French (fr) Nombre heureux		173
10	Dutch (nl) Gelukkig getal		171

More...

The following table shows the language versions of the article with the highest Authors’ Interest.

Language versions of the article "Happy number" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.

#	Language	AI award	Relative AI
1	English (en) Happy number		224
2	German (de) Fröhliche Zahl		64
3	French (fr) Nombre heureux		57
4	Italian (it) Numero felice		43
5	Hebrew (he) מספר שמח		40
6	Chinese (zh) 快樂數		35
7	Spanish (es) Número feliz		33
8	Hungarian (hu) Boldog szám		33
9	Dutch (nl) Gelukkig getal		31
10	Vietnamese (vi) Số may mắn		30

More...

The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

Language versions of the article "Happy number" with the highest AI in June 2026

#	Language	AI award	Relative AI
1	Basque (eu) Zenbaki alai		1
2	Hungarian (hu) Boldog szám		1
3	Chinese (zh) 快樂數		1
4	Arabic (ar) عدد سعيد		0
5	Bulgarian (bg) Щастливо число		0
6	Catalan (ca) Nombre feliç		0
7	Czech (cs) Šťastné číslo		0
8	German (de) Fröhliche Zahl		0
9	Greek (el) Ευτυχής αριθμός		0
10	English (en) Happy number		0

More...

The following table shows the language versions of the article with the highest number of citations.

Language versions of the article "Happy number" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	Czech (cs) Šťastné číslo		924
2	Swedish (sv) Glada tal		327
3	English (en) Happy number		325
4	Italian (it) Numero felice		192
5	Hungarian (hu) Boldog szám		159
6	Ukrainian (uk) Щасливе число		131
7	Polish (pl) Liczby wesołe		130
8	Arabic (ar) عدد سعيد		119
9	Chinese (zh) 快樂數		100
10	Japanese (ja) ハッピー数		96

More...

#	Language	Value
ar	Arabic عدد سعيد
bg	Bulgarian Щастливо число
ca	Catalan Nombre feliç
cs	Czech Šťastné číslo
de	German Fröhliche Zahl
el	Greek Ευτυχής αριθμός
en	English Happy number
es	Spanish Número feliz
eu	Basque Zenbaki alai
fa	Persian اعداد خوشحال
fi	Finnish Onnellinen luku
fr	French Nombre heureux
he	Hebrew מספר שמח
hu	Hungarian Boldog szám
hy	Armenian Ուրախ թիվ
it	Italian Numero felice
ja	Japanese ハッピー数
nl	Dutch Gelukkig getal
no	Norwegian Lykkelig tall
pl	Polish Liczby wesołe
pt	Portuguese Número feliz
ro	Romanian Număr fericit
ru	Russian Счастливое число (happy number)
sl	Slovenian Veselo število
sv	Swedish Glada tal
uk	Ukrainian Щасливе число
vi	Vietnamese Số may mắn
zh	Chinese 快樂數

Best Rank

English: #14063 04.2019

Global: #30289 04.2019

Best Rank

English: #8546 01.2005

Global: #3029 12.2011

On 1 July 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: 2026 FIFA World Cup, Kylian Mbappé, Erling Haaland, Democratic Republic of the Congo, FIFA World Cup, Harry Kane, Romelu Lukaku, Senegal, Michael Olise, Sadio Mané.

In English Wikipedia the most popular articles on that day were: 2026 FIFA World Cup, Harry Kane, Julián Quiñones, List of FIFA World Cup top goalscorers, Kylian Mbappé, Democratic Republic of the Congo, Erling Haaland, DR Congo national football team, Melat Kiros, FIFA World Cup.

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 50 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2026. When calculating current popularity and AI of articles data from June 2026 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2026... More information