The number 47015
47015 is a composite number with 4 divisors. Its prime factorisation is 5 × 9403. Divisors (4): 1, 5, 9403, 47015.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47015: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 5 × 9403, the product of two primes.
- 2
47015 is composite. Its prime factorisation is
- 3
The divisors add up to 56424; without 47015 itself that is 9409, so 47015 is deficient (9409 is less than 47015). Euler's totient φ(47015) = 37608 numbers up to 47015 share no factor with it.
- 4
The digits of 47015 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 251 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47015 = 5 \times 9403 \]
47015 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 56424 |
| Euler totient φ(n) | 37608 |
| Square | 2210410225 |
| Cube | 103922436728375 |
| Square root | 216.829426 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 251 |
| Scientific notation | 4.7015 × |
47015 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand and fifteen |
| Binary (base 2) | 1011011110100111 |
| Octal (base 8) | 133647 |
| Hexadecimal (base 16) | B7A7 |
| Base 3 | 2101111022 |
| As time | 47015 seconds = 13 h 3 min 35 s |
Is 47015 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 | Yes (47015 ÷ 5 = 9403) | 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 3) | 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 7) | 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 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | 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 47015 a prime number?
No. 47015 = 5 × 9403, so it is divisible by 5.
What are the factors of 47015?
1, 5, 9403, 47015.
What is 47015 in binary?
1011011110100111 (hexadecimal B7A7, octal 133647).
What is the square root of 47015?
About 216.8294.
Is 47015 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 47015?
47015 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 5 × 9403, the product of two primes.