Compare 400 vs 401
| Property | 400 | 401 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 2 | 1 |
| Total factors | 6 | 1 |
| Prime factorization | 24 × 52 | 4011 |
| Prime factorization | 2 × 2 × 2 × 2 × 5 × 5 | 401 |
| Divisors count | 15 | 2 |
| Divisors | 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400 | 1, 401 |
| Number of properties | 0 | 7 |
| Additive primes | 46th | |
| Chen primes | 56th | |
| Cousin primes (2nd member) | 22nd | |
| Isolated primes | 38th | |
| Primes | 79th | |
| Pythagorean primes | 38th | |
| Super primes | 22nd | |
| Roman numberals | CD | CDI |
| Base 2 | 1100100002 | 1100100012 |
| Base 3 | 1122113 | 1122123 |
| Base 4 | 121004 | 121014 |
| Base 5 | 31005 | 31015 |
| Base 6 | 15046 | 15056 |
| Base 7 | 11117 | 11127 |
| Base 8 | 6208 | 6218 |
| Base 9 | 4849 | 4859 |
| Base 10 | 40010 | 40110 |
| Base 11 | 33411 | 33511 |
| Base 12 | 29412 | 29512 |
| Base 13 | 24a13 | 24b13 |
| Base 14 | 20814 | 20914 |
| Base 15 | 1ba15 | 1bb15 |
| Base 16 | 19016 | 19116 |