123 in words
123
one hundred and twenty-three
123 is written one hundred and twenty-three.
Ways to write it
- As an ordinal
- one hundred and twenty-third
- Roman numeral
- CXXIII
- Expanded form
- 100 + 20 + 3
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 1 | 100 |
| tens | 2 | 20 |
| ones | 3 | 3 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 41 and 123 (4 factors)
- First 10 multiples
- 123, 246, 369, 492, 615, 738, 861, 984, 1,107, 1,230
- Square
- 123 × 123 = 15,129
- Square root
- ≈ 11.09
- Sum of the digits
- 1 + 2 + 3 = 6
- Rounded to the nearest 10
- 120
- Rounded to the nearest 100
- 100
- Number before
- 122
- Number after
- 124
- In binary
1111011
Quick check
What number comes just after 123?
Show the answer
124
Is 123 even or odd?
Show the answer
Odd
What is 123 + 10?
Show the answer
133
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Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.Frequently asked questions
How do you write 123 in words?
123 is written "one hundred and twenty-three".
Is 123 a prime number?
No. 123 is a composite number, because it has more than two factors.
What are the factors of 123?
The factors of 123 are 1, 3, 41 and 123.
How do you write 123 in Roman numerals?
123 in Roman numerals is CXXIII.