The number 42974
42974 is a composite number with 4 divisors. Its prime factorisation is 2 × 21487. Divisors (4): 1, 2, 21487, 42974.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42974: a semiprime: 2 × 21487, the product of two primes.
- 2
42974 is composite. Its prime factorisation is
- 3
The divisors add up to 64464; without 42974 itself that is 21490, so 42974 is deficient (21490 is less than 42974). Euler's totient φ(42974) = 21486 numbers up to 42974 share no factor with it.
- 4
The digits of 42974 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 132 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42974 = 2 \times 21487 \]
42974 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 64464 |
| Euler totient φ(n) | 21486 |
| Square | 1846764676 |
| Cube | 79362865186424 |
| Square root | 207.301712 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 132 |
| Scientific notation | 4.2974 × |
42974 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand nine hundred and seventy-four |
| Binary (base 2) | 1010011111011110 |
| Octal (base 8) | 123736 |
| Hexadecimal (base 16) | A7DE |
| Base 3 | 2011221122 |
| As time | 42974 seconds = 11 h 56 min 14 s |
Is 42974 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42974 ÷ 2 = 21487) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | 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 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 1) | 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 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 4) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 8) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42974 a prime number?
No. 42974 = 2 × 21487, so it is divisible by 2.
What are the factors of 42974?
1, 2, 21487, 42974.
What is 42974 in binary?
1010011111011110 (hexadecimal A7DE, octal 123736).
What is the square root of 42974?
About 207.3017.
Is 42974 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 42974?
42974 is a semiprime: 2 × 21487, the product of two primes.