The number 47240
47240 is a composite number with 16 divisors. Its prime factorisation is × 5 × 1181. Divisors (16): 1, 2, 4, 5, 8, 10, 20, 40, 1181, 2362, 4724, 5905, 9448, 11810, 23620, 47240.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
47240 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
47240 is composite. Its prime factorisation is
- 3
The divisors add up to 106380; without 47240 itself that is 59140, so 47240 is abundant (59140 is more than 47240). Euler's totient φ(47240) = 18880 numbers up to 47240 share no factor with it.
- 4
The digits of 47240 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 145 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47240 = 2^{3} \times 5 \times 1181 \]47240 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 106380 |
| Euler totient φ(n) | 18880 |
| Square | 2231617600 |
| Cube | 105421615424000 |
| Square root | 217.347648 (= 2√11810) |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 145 |
| Scientific notation | 4.724 × |
47240 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand two hundred and forty |
| Binary (base 2) | 1011100010001000 |
| Octal (base 8) | 134210 |
| Hexadecimal (base 16) | B888 |
| Base 3 | 2101210122 |
| As time | 47240 seconds = 13 h 7 min 20 s |
Is 47240 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (47240 ÷ 2 = 23620) | 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 | Yes (47240 ÷ 4 = 11810) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (47240 ÷ 5 = 9448) | 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 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 | Yes (47240 ÷ 8 = 5905) | 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 (47240 ÷ 10 = 4724) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 8) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47240 a prime number?
No. 47240 = × 5 × 1181, so it is divisible by 2.
What are the factors of 47240?
1, 2, 4, 5, 8, 10, 20, 40, 1181, 2362, 4724, 5905, 9448, 11810, 23620, 47240.
What is 47240 in binary?
1011100010001000 (hexadecimal B888, octal 134210).
What is the square root of 47240?
About 217.3476, exactly 2√11810.
Is 47240 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 47240?
It is a composite number with 16 divisors.