even, composite, perfect square · 400th positive integer
The number 400
400 is an even composite number. It is the 400th positive integer.
Quick reference
| Prime factorization | 2 × 2 × 2 × 2 × 5 × 5 |
| Divisors | 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400 |
| Binary | 110010000 |
| Hexadecimal | 0x190 |
| Roman numeral | CD |
| Digit sum | 4 |
| Properties | even, composite, perfect square |
Frequently asked
Is 400 a prime number?
No. 400 is composite. Its prime factorization is 2 × 2 × 2 × 2 × 5 × 5.
What are the factors of 400?
The factors (divisors) of 400 are 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400.
What is 400 in binary?
400 in binary is 110010000. In hexadecimal it's 190.
What is 400 as a Roman numeral?
400 in Roman numerals is CD.
What's the digit sum of 400?
Adding the digits of 400: 4 + 0 + 0 = 4.