Compare 18 vs 49
| Property | 18 | 49 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 2 | 1 |
| Total factors | 3 | 2 |
| Prime factorization | 21 × 32 | 72 |
| Prime factorization | 2 × 3 × 3 | 7 × 7 |
| Divisors count | 6 | 3 |
| Divisors | 1, 2, 3, 6, 9, 18 | 1, 7, 49 |
| Number of properties | 0 | 1 |
| Semiprimes | 17th | |
| Roman numberals | XVIII | XLIX |
| Base 2 | 100102 | 1100012 |
| Base 3 | 2003 | 12113 |
| Base 4 | 1024 | 3014 |
| Base 5 | 335 | 1445 |
| Base 6 | 306 | 1216 |
| Base 7 | 247 | 1007 |
| Base 8 | 228 | 618 |
| Base 9 | 209 | 549 |
| Base 10 | 1810 | 4910 |
| Base 11 | 1711 | 4511 |
| Base 12 | 1612 | 4112 |
| Base 13 | 1513 | 3a13 |
| Base 14 | 1414 | 3714 |
| Base 15 | 1315 | 3415 |
| Base 16 | 1216 | 3116 |