The number 42347
42347 is a composite number with 8 divisors. Its prime factorisation is 17 × 47 × 53. Divisors (8): 1, 17, 47, 53, 799, 901, 2491, 42347.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42347: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
42347 is composite. Its prime factorisation is
- 3
The divisors add up to 46656; without 42347 itself that is 4309, so 42347 is deficient (4309 is less than 42347). Euler's totient φ(42347) = 38272 numbers up to 42347 share no factor with it.
- 4
The digits of 42347 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 150 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42347 = 17 \times 47 \times 53 \]
42347 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 46656 |
| Euler totient φ(n) | 38272 |
| Square | 1793268409 |
| Cube | 75939537315923 |
| Square root | 205.783867 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 150 |
| Scientific notation | 4.2347 × |
42347 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand three hundred and forty-seven |
| Binary (base 2) | 1010010101101011 |
| Octal (base 8) | 122553 |
| Hexadecimal (base 16) | A56B |
| Base 3 | 2011002102 |
| As time | 42347 seconds = 11 h 45 min 47 s |
Is 42347 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 4) | 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 2) | 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 8) | 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 42347 a prime number?
No. 42347 = 17 × 47 × 53, so it is divisible by 17.
What are the factors of 42347?
1, 17, 47, 53, 799, 901, 2491, 42347.
What is 42347 in binary?
1010010101101011 (hexadecimal A56B, octal 122553).
What is the square root of 42347?
About 205.7839.
Is 42347 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 42347?
42347 is a happy number: repeatedly adding the squares of its digits reaches 1.