even, composite · 30th positive integer
The number 30
30 is an even composite number. It's known as the number of days in most months. It is the 30th positive integer.
Quick reference
| Prime factorization | 2 × 3 × 5 |
| Divisors | 1, 2, 3, 5, 6, 10, 15, 30 |
| Binary | 11110 |
| Hexadecimal | 0x1E |
| Roman numeral | XXX |
| Digit sum | 3 |
| Properties | even, composite |
Why 30 is notable
The number of days in most months.
Frequently asked
Is 30 a prime number?
No. 30 is composite. Its prime factorization is 2 × 3 × 5.
What are the factors of 30?
The factors (divisors) of 30 are 1, 2, 3, 5, 6, 10, 15, 30.
What is 30 in binary?
30 in binary is 11110. In hexadecimal it's 1E.
What is 30 as a Roman numeral?
30 in Roman numerals is XXX.
What's the digit sum of 30?
Adding the digits of 30: 3 + 0 = 3.