400,009 in words
400,009
four hundred thousand nine
400,009 is written four hundred thousand nine.
Ways to write it
- As an ordinal
- four hundred thousand ninth
- Expanded form
- 400,000 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| hundred thousands | 4 | 400,000 |
| ten thousands | 0 | 0 |
| thousands | 0 | 0 |
| hundreds | 0 | 0 |
| tens | 0 | 0 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 400,009 (2 factors)
- First 10 multiples
- 400,009, 800,018, 1,200,027, 1,600,036, 2,000,045, 2,400,054, 2,800,063, 3,200,072, 3,600,081, 4,000,090
- Square
- 400,009 × 400,009 = 160,007,200,081
- Square root
- ≈ 632.46
- Sum of the digits
- 4 + 0 + 0 + 0 + 0 + 9 = 13
- Rounded to the nearest 10
- 400,010
- Rounded to the nearest 100
- 400,000
- Rounded to the nearest 1000
- 400,000
- Number before
- 400,008
- Number after
- 400,010
- In binary
1100001101010001001
Quick check
What number comes just after 400,009?
Show the answer
400,010
Is 400,009 even or odd?
Show the answer
Odd
What is 400,009 + 10?
Show the answer
400,019
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Number Patterns
Find the missing number in a sequence.Frequently asked questions
How do you write 400,009 in words?
400,009 is written "four hundred thousand nine".
Is 400,009 a prime number?
Yes. 400,009 is a prime number: its only factors are 1 and 400,009.
What are the factors of 400,009?
The factors of 400,009 are 1 and 400,009.