Compare 19990 vs 19997
| Property | 19990 | 19997 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 21 × 51 × 19991 | 199971 |
| Prime factorization | 2 × 5 × 1999 | 19997 |
| Divisors count | 8 | 2 |
| Divisors | 1, 2, 5, 10, 1999, 3998, 9995, 19990 | 1, 19997 |
| Number of properties | 0 | 9 |
| Chen primes | 1112th | |
| Cousin primes (2nd member) | 344th | |
| Happy primes | 377th | |
| Harmonic primes | 821st | |
| Isolated primes | 1579th | |
| Primes | 2262nd | |
| Prime triplets (3rd member) | 168th | |
| Pythagorean primes | 1125th | |
| Sexy primes (2nd member) | 693rd | |
| Roman numberals | ||
| Base 2 | 1001110000101102 | 1001110000111012 |
| Base 3 | 10001021013 | 10001021223 |
| Base 4 | 103201124 | 103201314 |
| Base 5 | 11144305 | 11144425 |
| Base 6 | 2323146 | 2323256 |
| Base 7 | 1121657 | 1122057 |
| Base 8 | 470268 | 470358 |
| Base 9 | 303719 | 303789 |
| Base 10 | 1999010 | 1999710 |
| Base 11 | 1402311 | 1402a11 |
| Base 12 | b69a12 | b6a512 |
| Base 13 | 913913 | 914313 |
| Base 14 | 73dc14 | 740514 |
| Base 15 | 5dca15 | 5dd215 |
| Base 16 | 4e1616 | 4e1d16 |