Compare 397 vs 399
| Property | 397 | 399 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 3971 | 31 × 71 × 191 |
| Prime factorization | 397 | 3 × 7 × 19 |
| Divisors count | 2 | 8 |
| Divisors | 1, 397 | 1, 3, 7, 19, 21, 57, 133, 399 |
| Number of properties | 8 | 0 |
| Additive primes | 45th | |
| Cousin primes (1st member) | 22nd | |
| Cuban primes 1 | 8th | |
| Happy primes | 21st | |
| Isolated primes | 37th | |
| Left-truncatable primes | 31st | |
| Primes | 78th | |
| Pythagorean primes | 37th | |
| Roman numberals | CCCXCVII | CCCXCIX |
| Base 2 | 1100011012 | 1100011112 |
| Base 3 | 1122013 | 1122103 |
| Base 4 | 120314 | 120334 |
| Base 5 | 30425 | 30445 |
| Base 6 | 15016 | 15036 |
| Base 7 | 11057 | 11107 |
| Base 8 | 6158 | 6178 |
| Base 9 | 4819 | 4839 |
| Base 10 | 39710 | 39910 |
| Base 11 | 33111 | 33311 |
| Base 12 | 29112 | 29312 |
| Base 13 | 24713 | 24913 |
| Base 14 | 20514 | 20714 |
| Base 15 | 1b715 | 1b915 |
| Base 16 | 18d16 | 18f16 |