42,840 in words
42,840
forty-two thousand eight hundred forty
42,840 is written forty-two thousand eight hundred forty.
Ways to write it
- As an ordinal
- forty-two thousand eight hundred fortieth
- Expanded form
- 40,000 + 2,000 + 800 + 40
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 4 | 40,000 |
| thousands | 2 | 2,000 |
| hundreds | 8 | 800 |
| tens | 4 | 40 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 96 factors: too many to list
- First 10 multiples
- 42,840, 85,680, 128,520, 171,360, 214,200, 257,040, 299,880, 342,720, 385,560, 428,400
- Square
- 42,840 × 42,840 = 1,835,265,600
- Square root
- ≈ 206.98
- Sum of the digits
- 4 + 2 + 8 + 4 + 0 = 18
- Rounded to the nearest 10
- 42,840
- Rounded to the nearest 100
- 42,800
- Rounded to the nearest 1000
- 43,000
- Number before
- 42,839
- Number after
- 42,841
- In binary
1010011101011000
Quick check
What number comes just after 42,840?
Show the answer
42,841
Is 42,840 even or odd?
Show the answer
Even
What is 42,840 + 10?
Show the answer
42,850
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 42,840 in words?
42,840 is written "forty-two thousand eight hundred forty".
Is 42,840 a prime number?
No. 42,840 is a composite number, because it has more than two factors.