Back 400 (ахыԥхьаӡара) Abkhazian 400 (عدد) Arabic 400 (ədəd) Azerbaijani 400 (angka) BAN 400 (число) Bulgarian Quatre-cents Catalan ٤٠٠ (ژمارە) CKB 400 (číslo) Czech 400 (nùmer) EML Cuatrocientos Spanish
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| Cardinal | four hundred | |||
| Ordinal | 400th (four hundredth) | |||
| Factorization | 24 × 52 | |||
| Divisors | 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400 | |||
| Greek numeral | Υ´ | |||
| Roman numeral | CD | |||
| Binary | 1100100002 | |||
| Ternary | 1122113 | |||
| Senary | 15046 | |||
| Octal | 6208 | |||
| Duodecimal | 29412 | |||
| Hexadecimal | 19016 | |||
| Hebrew | ת | |||
| Armenian | Ն | |||
| Babylonian cuneiform | 𒐚𒐏 | |||
| Egyptian hieroglyph | 𓍥 | |||
400 (four hundred) is the natural number following 399 and preceding 401.