Factors of 40

The factors of 40 are 1, 2, 4, 5, 8, 10, 20 and 40. That is 8 factors in total.

A factor of 40 is a whole number that divides 40 exactly, with no remainder. 40 is a composite number because it has factors other than 1 and itself.

Factor pairs of 40

Two numbers that multiply to give 40:

1 × 40 = 40
2 × 20 = 40
4 × 10 = 40
5 × 8 = 40

Prime factorization of 40

40 = 2 × 2 × 2 × 5 = 2³ × 5. The prime factors of 40 are 2 and 5.

Quick facts about 40

Is 40 prime? No.
Even or odd: even.
Sum of its factors: 1 + 2 + 4 + 5 + 8 + 10 + 20 + 40 = 90.

Factors of nearby numbers

Number	Factors
36	1, 2, 3, 4, 6, 9, 12, 18, 36
37	1, 37
38	1, 2, 19, 38
39	1, 3, 13, 39
41	1, 41
42	1, 2, 3, 6, 7, 14, 21, 42
43	1, 43
44	1, 2, 4, 11, 22, 44

More about 40: 40 squared · square root of 40 · 40 in binary · 40 in Roman numerals.

Another number? Try the prime number checker, the GCF and LCM calculator or see all factor lists.