| Factorisation | 2 × 3 × 233 |
| Prime | no |
| Binary | 10101110110 |
| Hexadecimal | 0x576 |
| Bit length | 11 |
| Digit sum | 21 |
| Digits spoken | one three nine eight |
1398 sits inside the sequence 2139847, beginning at digit 2 of seven.
1398 falls below the cardinality of a PubMed record, a Canadian patent application, a European patent application. Those systems assign identifiers sequentially, so it necessarily holds one in each. This is a property of the registries, not of the number. The cardinalities are published here.