Compare 1399 vs 1987
| Property | 1399 | 1987 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 13991 | 19871 |
| Prime factorization | 1399 | 1987 |
| Divisors count | 2 | 2 |
| Divisors | 1, 1399 | 1, 1987 |
| Number of properties | 6 | 6 |
| Chen primes | 145th | |
| Emirps | 65th | |
| Good primes | 52nd | 62nd |
| Harmonic primes | 76th | |
| Isolated primes | 131st | 181st |
| Lucky primes | 70th | |
| Primes | 222nd | 300th |
| Sexy primes (1st member) | 127th | |
| Sexy prime triplets (1st member) | 50th | |
| Roman numberals | MCCCXCIX | MCMLXXXVII |
| Base 2 | 101011101112 | 111110000112 |
| Base 3 | 12202113 | 22011213 |
| Base 4 | 1113134 | 1330034 |
| Base 5 | 210445 | 304225 |
| Base 6 | 102516 | 131116 |
| Base 7 | 40367 | 55367 |
| Base 8 | 25678 | 37038 |
| Base 9 | 18249 | 26479 |
| Base 10 | 139910 | 198710 |
| Base 11 | 106211 | 154711 |
| Base 12 | 98712 | 119712 |
| Base 13 | 83813 | b9b13 |
| Base 14 | 71d14 | a1d14 |
| Base 15 | 63415 | 8c715 |
| Base 16 | 57716 | 7c316 |