409 in words
409
four hundred nine
409 is written four hundred nine.
Ways to write it
- As an ordinal
- four hundred ninth
- Roman numeral
- CDIX
- Expanded form
- 400 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 4 | 400 |
| tens | 0 | 0 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 409 (2 factors)
- First 10 multiples
- 409, 818, 1,227, 1,636, 2,045, 2,454, 2,863, 3,272, 3,681, 4,090
- Square
- 409 × 409 = 167,281
- Square root
- ≈ 20.22
- Sum of the digits
- 4 + 0 + 9 = 13
- Rounded to the nearest 10
- 410
- Rounded to the nearest 100
- 400
- Number before
- 408
- Number after
- 410
- In binary
110011001
Quick check
What number comes just after 409?
Show the answer
410
Is 409 even or odd?
Show the answer
Odd
What is 409 + 10?
Show the answer
419
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 409 in words?
409 is written "four hundred nine".
Is 409 a prime number?
Yes. 409 is a prime number: its only factors are 1 and 409.
What are the factors of 409?
The factors of 409 are 1 and 409.
How do you write 409 in Roman numerals?
409 in Roman numerals is CDIX.