Compare 387 vs 389
| Property | 387 | 389 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 2 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 32 × 431 | 3891 |
| Prime factorization | 3 × 3 × 43 | 389 |
| Divisors count | 6 | 2 |
| Divisors | 1, 3, 9, 43, 129, 387 | 1, 389 |
| Number of properties | 0 | 7 |
| Chen primes | 55th | |
| Emirps | 20th | |
| Isolated primes | 36th | |
| Long primes | 29th | |
| Primes | 77th | |
| Pythagorean primes | 36th | |
| Sexy primes (2nd member) | 42nd | |
| Roman numberals | CCCLXXXVII | CCCLXXXIX |
| Base 2 | 1100000112 | 1100001012 |
| Base 3 | 1121003 | 1121023 |
| Base 4 | 120034 | 120114 |
| Base 5 | 30225 | 30245 |
| Base 6 | 14436 | 14456 |
| Base 7 | 10627 | 10647 |
| Base 8 | 6038 | 6058 |
| Base 9 | 4709 | 4729 |
| Base 10 | 38710 | 38910 |
| Base 11 | 32211 | 32411 |
| Base 12 | 28312 | 28512 |
| Base 13 | 23a13 | 23c13 |
| Base 14 | 1d914 | 1db14 |
| Base 15 | 1ac15 | 1ae15 |
| Base 16 | 18316 | 18516 |