Back 1729 (عدد) Arabic ১৭২৯ (সংখ্যা) Assamese ১৭২৯ (সংখ্যা) Bengali/Bangla 1729 (tal) Danish 1729 (Zahl) German 1729 (nùmer) EML Mil setecientos veintinueve Spanish ۱۷۲۹ (عدد) Persian 1729 (luku) Finnish 1 729 (nombre) French
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| Cardinal | one thousand seven hundred twenty-nine | |||
| Ordinal | 1729th (one thousand seven hundred twenty-ninth) | |||
| Factorization | 7 × 13 × 19 | |||
| Divisors | 1, 7, 13, 19, 91, 133, 247, 1729 | |||
| Greek numeral | ,ΑΨΚΘ´ | |||
| Roman numeral | MDCCXXIX | |||
| Binary | 110110000012 | |||
| Ternary | 21010013 | |||
| Senary | 120016 | |||
| Octal | 33018 | |||
| Duodecimal | 100112 | |||
| Hexadecimal | 6C116 | |||
1729 is the natural number following 1728 and preceding 1730. It is the first nontrivial taxicab number, expressed as the sum of two cubic numbers in two different ways. It is also known as the Ramanujan number or Hardy–Ramanujan number, named after G. H. Hardy and Srinivasa Ramanujan.