Compare 1987 vs 1990
| Property | 1987 | 1990 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 19871 | 21 × 51 × 1991 |
| Prime factorization | 1987 | 2 × 5 × 199 |
| Divisors count | 2 | 8 |
| Divisors | 1, 1987 | 1, 2, 5, 10, 199, 398, 995, 1990 |
| Number of properties | 6 | 0 |
| Good primes | 62nd | |
| Isolated primes | 181st | |
| Lucky primes | 70th | |
| Primes | 300th | |
| Sexy primes (1st member) | 127th | |
| Sexy prime triplets (1st member) | 50th | |
| Roman numberals | MCMLXXXVII | MCMXC |
| Base 2 | 111110000112 | 111110001102 |
| Base 3 | 22011213 | 22012013 |
| Base 4 | 1330034 | 1330124 |
| Base 5 | 304225 | 304305 |
| Base 6 | 131116 | 131146 |
| Base 7 | 55367 | 55427 |
| Base 8 | 37038 | 37068 |
| Base 9 | 26479 | 26519 |
| Base 10 | 198710 | 199010 |
| Base 11 | 154711 | 154a11 |
| Base 12 | 119712 | 119a12 |
| Base 13 | b9b13 | ba113 |
| Base 14 | a1d14 | a2214 |
| Base 15 | 8c715 | 8ca15 |
| Base 16 | 7c316 | 7c616 |