The number 42982
42982 is a composite number with 4 divisors. Its prime factorisation is 2 × 21491. Divisors (4): 1, 2, 21491, 42982.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42982: a semiprime: 2 × 21491, the product of two primes.
- 2
42982 is composite. Its prime factorisation is
- 3
The divisors add up to 64476; without 42982 itself that is 21494, so 42982 is deficient (21494 is less than 42982). Euler's totient φ(42982) = 21490 numbers up to 42982 share no factor with it.
- 4
The digits of 42982 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 57 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42982 = 2 \times 21491 \]
42982 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 64476 |
| Euler totient φ(n) | 21490 |
| Square | 1847452324 |
| Cube | 79407195790168 |
| Square root | 207.321007 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 57 |
| Scientific notation | 4.2982 × |
42982 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand nine hundred and eighty-two |
| Binary (base 2) | 1010011111100110 |
| Octal (base 8) | 123746 |
| Hexadecimal (base 16) | A7E6 |
| Base 3 | 2011221221 |
| As time | 42982 seconds = 11 h 56 min 22 s |
Is 42982 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42982 ÷ 2 = 21491) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42982 a prime number?
No. 42982 = 2 × 21491, so it is divisible by 2.
What are the factors of 42982?
1, 2, 21491, 42982.
What is 42982 in binary?
1010011111100110 (hexadecimal A7E6, octal 123746).
What is the square root of 42982?
About 207.3210.
Is 42982 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 42982?
42982 is a semiprime: 2 × 21491, the product of two primes.