The number 47918
47918 is a composite number with 16 divisors. Its prime factorisation is 2 × 13 × 19 × 97. Divisors (16): 1, 2, 13, 19, 26, 38, 97, 194, 247, 494, 1261, 1843, 2522, 3686, 23959, 47918.
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How to work it out
- 1
47918 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
47918 is composite. Its prime factorisation is
- 3
The divisors add up to 82320; without 47918 itself that is 34402, so 47918 is deficient (34402 is less than 47918). Euler's totient φ(47918) = 20736 numbers up to 47918 share no factor with it.
- 4
The digits of 47918 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 189 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47918 = 2 \times 13 \times 19 \times 97 \]
47918 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 82320 |
| Euler totient φ(n) | 20736 |
| Square | 2296134724 |
| Cube | 110026183704632 |
| Square root | 218.901804 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 189 |
| Scientific notation | 4.7918 × |
47918 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand nine hundred and eighteen |
| Binary (base 2) | 1011101100101110 |
| Octal (base 8) | 135456 |
| Hexadecimal (base 16) | BB2E |
| Base 3 | 2102201202 |
| As time | 47918 seconds = 13 h 18 min 38 s |
Is 47918 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (47918 ÷ 2 = 23959) | 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 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 6) | 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 2) | 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 47918 a prime number?
No. 47918 = 2 × 13 × 19 × 97, so it is divisible by 2.
What are the factors of 47918?
1, 2, 13, 19, 26, 38, 97, 194, 247, 494, 1261, 1843, 2522, 3686, 23959, 47918.
What is 47918 in binary?
1011101100101110 (hexadecimal BB2E, octal 135456).
What is the square root of 47918?
About 218.9018.
Is 47918 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 47918?
It is a composite number with 16 divisors.