40 (number)

40 (forty) is the number that is after thirty-nine and before forty-one.

← 39 40 41 →
← 40 41 42 43 44 45 46 47 48 49 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	forty
Ordinal	40th (fortieth)
Factorization	23× 5
Greek numeral	Μ´
Roman numeral	XL
Binary	1010002
Ternary	11113
Quaternary	2204
Quinary	1305
Senary	1046
Octal	508
Duodecimal	3412
Hexadecimal	2816
Vigesimal	2020
Base 36	1436

The prime factors of forty are 2 and 5. (2 * 2 * 2 * 5 = 40)

Forty is also the only number in the English language which is spelt in alphabetical order.

The Bible

In the Judeo-Christian Bible, the number forty has special meaning. The Jews wandered in a desert for forty years, there was a forty-day and forty-night rainstorm, and other instances.

Factors of 40

The factors of 40 are 1, 2, 4, 5, 8, 10, 20 and 40.