729 in Roman Numerals
729
DCCXXI (subtracted)X
seven hundred twenty-nine
How DCCXXIX is formed
| Place | Value | Symbols |
|---|---|---|
| Hundreds | 700 | DCC |
| Tens | 20 | XX |
| Units | 9 | I (subtracted)X |
| Total | 729 | DCCXXIX |
DCCXXIX is written one place at a time, from the largest to the smallest: DCC (700) + XX (20) + IX (9) = 729.
IX is the only subtraction: the I before the X takes away 1, so IX = 9.
Common mistakes
Wrong: DCCXXVIIII
Why isn't 729 written as DCCXXVIIII?
A symbol can't be repeated four times in a row. 9 is IX (10 − 1), not VIIII, so 729 is DCCXXIX.
Numbers near 729
Properties of 729
- Prime factors
- 3⁶
- Divisors
- 1, 3, 9, 27, 81, 243, 729
- Even or odd
- Odd
- Prime number
- No
- Letters in DCCXXIX
- 7
729 is a perfect square: 27 × 27.729 is a perfect cube: 9 × 9 × 9.
729,000 in Roman numerals
With a bar over it (vinculum), D̅C̅C̅X̅X̅I̅X̅ means 729 × 1,000 = 729,000. How Roman numerals work