40
natural number
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Summary
40 is a positive integer[1]. 40 ranks in the top 3% of positive integer entities by monthly Wikipedia readership (3,339 views/month).[2]
Key Facts
- Instance of: even number[3], octagonal number[4], pentagonal pyramidal number[5], composite number[6], Zumkeller number[7], abundant number[8], harshad number[9]
- Named after: Сорок (единица счёта)[10]
- Commons category: 40 (number)[11]
- Unicode character: ㊵[12], ㉋[13]
- Topic's main category: Category:40 (number)[14]
- Numeric value: 40[15]
- Described by source: Explanatory Dictionary of the Living Great Russian Language[16], Brockhaus and Efron Encyclopedic Dictionary[17], Encyclopædia Britannica 11th edition[18], The Encyclopedia Americana[19]
- NCI Thesaurus ID: C105795[20]
- Code: ௪௰[21], ௪0[22], ៤០[23], XL[24], 𒐏[25], 101000[26], 1111[27], 220[28], 130[29], 104[30], 55[31], 44[32], 50[33], 40[34]
- Prime factor: 2[35], 5[36]
- Maintained by WikiProject: WikiProject Mathematics[37]
- Number of decimal digits: 2[38]
- Name in hiero markup: V20:V20-V20:V20[39]
- Mathematical inverse: −40[40]
Why It Matters
40 has Wikipedia articles in 29 language editions, a strong signal of global cultural recognition.[41] 40 is known by 48 alternative names across languages and contexts.[42]