Compare 397 vs 398
| Property | 397 | 398 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 3971 | 21 × 1991 |
| Prime factorization | 397 | 2 × 199 |
| Divisors count | 2 | 4 |
| Divisors | 1, 397 | 1, 2, 199, 398 |
| Number of properties | 8 | 1 |
| 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 | |
| Semiprimes | 126th | |
| Roman numberals | CCCXCVII | CCCXCVIII |
| Base 2 | 1100011012 | 1100011102 |
| Base 3 | 1122013 | 1122023 |
| Base 4 | 120314 | 120324 |
| Base 5 | 30425 | 30435 |
| Base 6 | 15016 | 15026 |
| Base 7 | 11057 | 11067 |
| Base 8 | 6158 | 6168 |
| Base 9 | 4819 | 4829 |
| Base 10 | 39710 | 39810 |
| Base 11 | 33111 | 33211 |
| Base 12 | 29112 | 29212 |
| Base 13 | 24713 | 24813 |
| Base 14 | 20514 | 20614 |
| Base 15 | 1b715 | 1b815 |
| Base 16 | 18d16 | 18e16 |