even, composite · 42nd positive integer
The number 42
42 is an even composite number. It's known as the answer to the ultimate question of life, the universe, and everything (Douglas Adams). It is the 42nd positive integer.
Quick reference
| Prime factorization | 2 × 3 × 7 |
| Divisors | 1, 2, 3, 6, 7, 14, 21, 42 |
| Binary | 101010 |
| Hexadecimal | 0x2A |
| Roman numeral | XLII |
| Digit sum | 6 |
| Properties | even, composite |
Why 42 is notable
The answer to the ultimate question of life, the universe, and everything (Douglas Adams).
Frequently asked
Is 42 a prime number?
No. 42 is composite. Its prime factorization is 2 × 3 × 7.
What are the factors of 42?
The factors (divisors) of 42 are 1, 2, 3, 6, 7, 14, 21, 42.
What is 42 in binary?
42 in binary is 101010. In hexadecimal it's 2A.
What is 42 as a Roman numeral?
42 in Roman numerals is XLII.
What's the digit sum of 42?
Adding the digits of 42: 4 + 2 = 6.