The number 47018
47018 is a composite number with 4 divisors. Its prime factorisation is 2 × 23509. Divisors (4): 1, 2, 23509, 47018.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47018: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 23509, the product of two primes.
- 2
47018 is composite. Its prime factorisation is
- 3
The divisors add up to 70530; without 47018 itself that is 23512, so 47018 is deficient (23512 is less than 47018). Euler's totient φ(47018) = 23508 numbers up to 47018 share no factor with it.
- 4
The digits of 47018 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 52 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47018 = 2 \times 23509 \]
47018 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 70530 |
| Euler totient φ(n) | 23508 |
| Square | 2210692324 |
| Cube | 103942331689832 |
| Square root | 216.836344 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 52 |
| Scientific notation | 4.7018 × |
47018 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand and eighteen |
| Binary (base 2) | 1011011110101010 |
| Octal (base 8) | 133652 |
| Hexadecimal (base 16) | B7AA |
| Base 3 | 2101111102 |
| As time | 47018 seconds = 13 h 3 min 38 s |
Is 47018 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (47018 ÷ 2 = 23509) | 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 3) | 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 6) | 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 2) | 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 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | 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 47018 a prime number?
No. 47018 = 2 × 23509, so it is divisible by 2.
What are the factors of 47018?
1, 2, 23509, 47018.
What is 47018 in binary?
1011011110101010 (hexadecimal B7AA, octal 133652).
What is the square root of 47018?
About 216.8363.
Is 47018 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 47018?
47018 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 23509, the product of two primes.