The number 47390
47390 is a composite number with 16 divisors. Its prime factorisation is 2 × 5 × 7 × 677. Divisors (16): 1, 2, 5, 7, 10, 14, 35, 70, 677, 1354, 3385, 4739, 6770, 9478, 23695, 47390.
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How to work it out
- 1
47390 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
47390 is composite. Its prime factorisation is
- 3
The divisors add up to 97632; without 47390 itself that is 50242, so 47390 is abundant (50242 is more than 47390). Euler's totient φ(47390) = 16224 numbers up to 47390 share no factor with it.
- 4
The digits of 47390 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47390 = 2 \times 5 \times 7 \times 677 \]
47390 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 97632 |
| Euler totient φ(n) | 16224 |
| Square | 2245812100 |
| Cube | 106429035419000 |
| Square root | 217.692444 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 75 |
| Scientific notation | 4.739 × |
47390 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand three hundred and ninety |
| Binary (base 2) | 1011100100011110 |
| Octal (base 8) | 134436 |
| Hexadecimal (base 16) | B91E |
| Base 3 | 2102000012 |
| As time | 47390 seconds = 13 h 9 min 50 s |
Is 47390 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (47390 ÷ 2 = 23695) | 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 (47390 ÷ 5 = 9478) | 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 | Yes (47390 ÷ 7 = 6770) | 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 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (47390 ÷ 10 = 4739) | 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 47390 a prime number?
No. 47390 = 2 × 5 × 7 × 677, so it is divisible by 2.
What are the factors of 47390?
1, 2, 5, 7, 10, 14, 35, 70, 677, 1354, 3385, 4739, 6770, 9478, 23695, 47390.
What is 47390 in binary?
1011100100011110 (hexadecimal B91E, octal 134436).
What is the square root of 47390?
About 217.6924.
Is 47390 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 47390?
It is a composite number with 16 divisors.