Factors of 3990
The factors of 3990 are 1, 2, 3, 5, 6, 7, 10, 14, 15, 19, 21, 30, 35, 38, 42, 57, 70, 95, 105, 114, 133, 190, 210, 266, 285, 399, 570, 665, 798, 1330, 1995, 3990. It has 32 factors.
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 3990 is a whole number that divides it with nothing left over. You only need to test the numbers up to √3990 ≈ 63.17; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 32 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: the sum is 11520. Without 3990 itself that is 7530, so 3990 is an abundant number.
LaTeX source of the formulas on this page
\[ 3990 = 2 \times 3 \times 5 \times 7 \times 19 \]
Factor pairs of 3990
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 3990 | 1 × 3990 = 3990 |
| 2 | 1995 | 2 × 1995 = 3990 |
| 3 | 1330 | 3 × 1330 = 3990 |
| 5 | 798 | 5 × 798 = 3990 |
| 6 | 665 | 6 × 665 = 3990 |
| 7 | 570 | 7 × 570 = 3990 |
| 10 | 399 | 10 × 399 = 3990 |
| 14 | 285 | 14 × 285 = 3990 |
| 15 | 266 | 15 × 266 = 3990 |
| 19 | 210 | 19 × 210 = 3990 |
| 21 | 190 | 21 × 190 = 3990 |
| 30 | 133 | 30 × 133 = 3990 |
| 35 | 114 | 35 × 114 = 3990 |
| 38 | 105 | 38 × 105 = 3990 |
| 42 | 95 | 42 × 95 = 3990 |
| 57 | 70 | 57 × 70 = 3990 |
Questions
What are the factors of 3990?
The factors of 3990 are 1, 2, 3, 5, 6, 7, 10, 14, 15, 19, 21, 30, 35, 38, 42, 57, 70, 95, 105, 114, 133, 190, 210, 266, 285, 399, 570, 665, 798, 1330, 1995, 3990. It has 32 factors.
What are the prime factors of 3990?
2, 3, 5, 7, 19. As a product: 2 × 3 × 5 × 7 × 19.
How many factors does 3990 have?
3990 has 32 factors (16 factor pairs).
What is the sum of the factors of 3990?
11520.
Is 3990 a prime number?
No. It is divisible by 2, so 3990 = 2 × 1995.