Factors of 1240
The factors of 1240 are 1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240. It has 16 factors.
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 1240 is a whole number that divides it with nothing left over. You only need to test the numbers up to √1240 ≈ 35.21; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 16 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: the sum is 2880. Without 1240 itself that is 1640, so 1240 is an abundant number.
LaTeX source of the formulas on this page
\[ 1240 = 2^{3} \times 5 \times 31 \]Factor pairs of 1240
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 1240 | 1 × 1240 = 1240 |
| 2 | 620 | 2 × 620 = 1240 |
| 4 | 310 | 4 × 310 = 1240 |
| 5 | 248 | 5 × 248 = 1240 |
| 8 | 155 | 8 × 155 = 1240 |
| 10 | 124 | 10 × 124 = 1240 |
| 20 | 62 | 20 × 62 = 1240 |
| 31 | 40 | 31 × 40 = 1240 |
Questions
What are the factors of 1240?
The factors of 1240 are 1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240. It has 16 factors.
What are the prime factors of 1240?
2, 5, 31. As a product: × 5 × 31.
How many factors does 1240 have?
1240 has 16 factors (8 factor pairs).
What is the sum of the factors of 1240?
2880.
Is 1240 a prime number?
No. It is divisible by 2, so 1240 = 2 × 620.