odd, composite · 399th positive integer
The number 399
399 is an odd composite number. It is the 399th positive integer.
Quick reference
| Prime factorization | 3 × 7 × 19 |
| Divisors | 1, 3, 7, 19, 21, 57, 133, 399 |
| Binary | 110001111 |
| Hexadecimal | 0x18F |
| Roman numeral | CCCXCIX |
| Digit sum | 21 |
| Properties | odd, composite |
Frequently asked
Is 399 a prime number?
No. 399 is composite. Its prime factorization is 3 × 7 × 19.
What are the factors of 399?
The factors (divisors) of 399 are 1, 3, 7, 19, 21, 57, 133, 399.
What is 399 in binary?
399 in binary is 110001111. In hexadecimal it's 18F.
What is 399 as a Roman numeral?
399 in Roman numerals is CCCXCIX.
What's the digit sum of 399?
Adding the digits of 399: 3 + 9 + 9 = 21.