The number 42470
42470 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 31 × 137. Divisors (16): 1, 2, 5, 10, 31, 62, 137, 155, 274, 310, 685, 1370, 4247, 8494, 21235, 42470.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42470 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42470 is composite. Its prime factorisation is
- 3
The divisors add up to 79488; without 42470 itself that is 37018, so 42470 is deficient (37018 is less than 42470). Euler's totient φ(42470) = 16320 numbers up to 42470 share no factor with it.
- 4
The digits of 42470 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 256 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42470 = 2 \times 5 \times 31 \times 137 \]
42470 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 79488 |
| Euler totient φ(n) | 16320 |
| Square | 1803700900 |
| Cube | 76603177223000 |
| Square root | 206.082508 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 256 |
| Scientific notation | 4.247 × |
42470 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand four hundred and seventy |
| Binary (base 2) | 1010010111100110 |
| Octal (base 8) | 122746 |
| Hexadecimal (base 16) | A5E6 |
| Base 3 | 2011020222 |
| As time | 42470 seconds = 11 h 47 min 50 s |
Is 42470 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42470 ÷ 2 = 21235) | 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 | Yes (42470 ÷ 5 = 8494) | 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 | Yes (42470 ÷ 10 = 4247) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 42470 a prime number?
No. 42470 = 2 × 5 × 31 × 137, so it is divisible by 2.
What are the factors of 42470?
1, 2, 5, 10, 31, 62, 137, 155, 274, 310, 685, 1370, 4247, 8494, 21235, 42470.
What is 42470 in binary?
1010010111100110 (hexadecimal A5E6, octal 122746).
What is the square root of 42470?
About 206.0825.
Is 42470 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 42470?
It is a composite number with 16 divisors.