even, composite · 40th positive integer
The number 40
40 is an even composite number. It is the 40th positive integer.
Quick reference
| Prime factorization | 2 × 2 × 2 × 5 |
| Divisors | 1, 2, 4, 5, 8, 10, 20, 40 |
| Binary | 101000 |
| Hexadecimal | 0x28 |
| Roman numeral | XL |
| Digit sum | 4 |
| Properties | even, composite |
Frequently asked
Is 40 a prime number?
No. 40 is composite. Its prime factorization is 2 × 2 × 2 × 5.
What are the factors of 40?
The factors (divisors) of 40 are 1, 2, 4, 5, 8, 10, 20, 40.
What is 40 in binary?
40 in binary is 101000. In hexadecimal it's 28.
What is 40 as a Roman numeral?
40 in Roman numerals is XL.
What's the digit sum of 40?
Adding the digits of 40: 4 + 0 = 4.