The number 42947
42947 is a composite number with 4 divisors. Its prime factorisation is 67 × 641. Divisors (4): 1, 67, 641, 42947.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42947: a semiprime: 67 × 641, the product of two primes.
- 2
42947 is composite. Its prime factorisation is
- 3
The divisors add up to 43656; without 42947 itself that is 709, so 42947 is deficient (709 is less than 42947). Euler's totient φ(42947) = 42240 numbers up to 42947 share no factor with it.
- 4
The digits of 42947 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 49 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42947 = 67 \times 641 \]
42947 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 43656 |
| Euler totient φ(n) | 42240 |
| Square | 1844444809 |
| Cube | 79213371212123 |
| Square root | 207.236580 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 49 |
| Scientific notation | 4.2947 × |
42947 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand nine hundred and forty-seven |
| Binary (base 2) | 1010011111000011 |
| Octal (base 8) | 123703 |
| Hexadecimal (base 16) | A7C3 |
| Base 3 | 2011220122 |
| As time | 42947 seconds = 11 h 55 min 47 s |
Is 42947 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | 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 3) | 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 5) | 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 3) | 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 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42947 a prime number?
No. 42947 = 67 × 641, so it is divisible by 67.
What are the factors of 42947?
1, 67, 641, 42947.
What is 42947 in binary?
1010011111000011 (hexadecimal A7C3, octal 123703).
What is the square root of 42947?
About 207.2366.
Is 42947 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 42947?
42947 is a semiprime: 67 × 641, the product of two primes.