The number 47321
47321 is a composite number with 4 divisors. Its prime factorisation is 79 × 599. Divisors (4): 1, 79, 599, 47321.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47321: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 79 × 599, the product of two primes.
- 2
47321 is composite. Its prime factorisation is
- 3
The divisors add up to 48000; without 47321 itself that is 679, so 47321 is deficient (679 is less than 47321). Euler's totient φ(47321) = 46644 numbers up to 47321 share no factor with it.
- 4
The digits of 47321 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 83 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47321 = 79 \times 599 \]
47321 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 48000 |
| Euler totient φ(n) | 46644 |
| Square | 2239277041 |
| Cube | 105964828857161 |
| Square root | 217.533905 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 83 |
| Scientific notation | 4.7321 × |
47321 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand three hundred and twenty-one |
| Binary (base 2) | 1011100011011001 |
| Octal (base 8) | 134331 |
| Hexadecimal (base 16) | B8D9 |
| Base 3 | 2101220122 |
| As time | 47321 seconds = 13 h 8 min 41 s |
Is 47321 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 1) | 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 1) | 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 1) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47321 a prime number?
No. 47321 = 79 × 599, so it is divisible by 79.
What are the factors of 47321?
1, 79, 599, 47321.
What is 47321 in binary?
1011100011011001 (hexadecimal B8D9, octal 134331).
What is the square root of 47321?
About 217.5339.
Is 47321 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 47321?
47321 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 79 × 599, the product of two primes.