3,721 in words
3,721
three thousand seven hundred twenty-one
3,721 is written three thousand seven hundred twenty-one.
Ways to write it
- As an ordinal
- three thousand seven hundred twenty-first
- Roman numeral
- MMMDCCXXI
- Expanded form
- 3,000 + 700 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| thousands | 3 | 3,000 |
| hundreds | 7 | 700 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 61 and 3,721 (3 factors)
- First 10 multiples
- 3,721, 7,442, 11,163, 14,884, 18,605, 22,326, 26,047, 29,768, 33,489, 37,210
- Square
- 3,721 × 3,721 = 13,845,841
- Square root
- 61
- Sum of the digits
- 3 + 7 + 2 + 1 = 13
- Rounded to the nearest 10
- 3,720
- Rounded to the nearest 100
- 3,700
- Rounded to the nearest 1000
- 4,000
- Number before
- 3,720
- Number after
- 3,722
- In binary
111010001001
Quick check
What number comes just after 3,721?
Show the answer
3,722
Is 3,721 even or odd?
Show the answer
Odd
What is 3,721 + 10?
Show the answer
3,731
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 3,721 in words?
3,721 is written "three thousand seven hundred twenty-one".
Is 3,721 a prime number?
No. 3,721 is a composite number, because it has more than two factors.
What are the factors of 3,721?
The factors of 3,721 are 1, 61 and 3,721.
How do you write 3,721 in Roman numerals?
3,721 in Roman numerals is MMMDCCXXI.