729 in words
729
seven hundred twenty-nine
729 is written seven hundred twenty-nine.
Ways to write it
- As an ordinal
- seven hundred twenty-ninth
- Roman numeral
- DCCXXIX
- Expanded form
- 700 + 20 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 7 | 700 |
| tens | 2 | 20 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 9, 27, 81, 243 and 729 (7 factors)
- First 10 multiples
- 729, 1,458, 2,187, 2,916, 3,645, 4,374, 5,103, 5,832, 6,561, 7,290
- Square
- 729 × 729 = 531,441
- Square root
- 27
- Cube root
- 9
- Sum of the digits
- 7 + 2 + 9 = 18
- Rounded to the nearest 10
- 730
- Rounded to the nearest 100
- 700
- Number before
- 728
- Number after
- 730
- In binary
1011011001
Quick check
What number comes just after 729?
Show the answer
730
Is 729 even or odd?
Show the answer
Odd
What is 729 + 10?
Show the answer
739
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Roman Numerals
Read and write Roman numerals from I to 3,999.Frequently asked questions
How do you write 729 in words?
729 is written "seven hundred twenty-nine".
Is 729 a prime number?
No. 729 is a composite number, because it has more than two factors.
What are the factors of 729?
The factors of 729 are 1, 3, 9, 27, 81, 243 and 729.
How do you write 729 in Roman numerals?
729 in Roman numerals is DCCXXIX.