Compare 387 vs 397
| Property | 387 | 397 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 2 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 32 × 431 | 3971 |
| Prime factorization | 3 × 3 × 43 | 397 |
| Divisors count | 6 | 2 |
| Divisors | 1, 3, 9, 43, 129, 387 | 1, 397 |
| Number of properties | 0 | 8 |
| 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 | CCCLXXXVII | CCCXCVII |
| Base 2 | 1100000112 | 1100011012 |
| Base 3 | 1121003 | 1122013 |
| Base 4 | 120034 | 120314 |
| Base 5 | 30225 | 30425 |
| Base 6 | 14436 | 15016 |
| Base 7 | 10627 | 11057 |
| Base 8 | 6038 | 6158 |
| Base 9 | 4709 | 4819 |
| Base 10 | 38710 | 39710 |
| Base 11 | 32211 | 33111 |
| Base 12 | 28312 | 29112 |
| Base 13 | 23a13 | 24713 |
| Base 14 | 1d914 | 20514 |
| Base 15 | 1ac15 | 1b715 |
| Base 16 | 18316 | 18d16 |