Factors of 42
The factors of 42 are 1, 2, 3, 6, 7, 14, 21, 42. It has 8 factors.
Factors of 42
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A factor of 42 is a whole number that divides it with nothing left over. You only need to test the numbers up to √42 ≈ 6.48; every one that divides gives a pair.
- 2
The factor pairs are listed in the table below. Together they give 8 factors.
- 3
Prime factorisation: keep dividing by the smallest prime that fits.
- 4
Add all the factors: 1 + 2 + 3 + 6 + 7 + 14 + 21 + 42 = 96. Without 42 itself that is 54, so 42 is an abundant number.
LaTeX source of the formulas on this page
\[ 42 = 2 \times 3 \times 7 \]
Factor pairs of 42
| Factor | Pairs with | Product |
|---|---|---|
| 1 | 42 | 1 × 42 = 42 |
| 2 | 21 | 2 × 21 = 42 |
| 3 | 14 | 3 × 14 = 42 |
| 6 | 7 | 6 × 7 = 42 |
Questions
What are the factors of 42?
The factors of 42 are 1, 2, 3, 6, 7, 14, 21, 42. It has 8 factors.
What are the prime factors of 42?
2, 3, 7. As a product: 2 × 3 × 7.
How many factors does 42 have?
42 has 8 factors (4 factor pairs).
What is the sum of the factors of 42?
96.
Is 42 a prime number?
No. It is divisible by 2, so 42 = 2 × 21.