The number 40

Representation numerals

Greek numeral

μ

Arabic numeral

٤٠

Roman numeral

XL

Maya numeral

●●

Chinese numeral

四十

Hebrew numeral

מ
Numeral systems
Binary: 101000
Septimal (base 7): 55
Octal: 50
Hexadecimal: 28
Base 24: 1G
Factorization
40 = 2 × 2 × 2 × 5
40 has 8 divisors: 1, 2, 4, 5, 8, 10, 20, 40
Sum of all divisors other than 40: 50
Sums & differences
Sum of 2 squares: 40 = 62 + 22
Difference of 2 squares: 40 = 72 - 32 = 112 - 92
Goldbach conjecture: 40 = 37 + 3 = 29 + 11 = 23 + 17
Characteristics
40 is a octogonal number
40 is a palindromic number in septimal system (55)
Related primes
The 40th prime number is: 173
Previous prime number: 37 — Next prime number: 41
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