The number 47689
47689 is a composite number with 4 divisors. Its prime factorisation is 103 × 463. Divisors (4): 1, 103, 463, 47689.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47689: a semiprime: 103 × 463, the product of two primes.
- 2
47689 is composite. Its prime factorisation is
- 3
The divisors add up to 48256; without 47689 itself that is 567, so 47689 is deficient (567 is less than 47689). Euler's totient φ(47689) = 47124 numbers up to 47689 share no factor with it.
- 4
The digits of 47689 add up to 34, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 145 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47689 = 103 \times 463 \]
47689 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 48256 |
| Euler totient φ(n) | 47124 |
| Square | 2274240721 |
| Cube | 108456265743769 |
| Square root | 218.378112 |
| Digit sum / digital root | 34 / 7 |
| Collatz steps to 1 | 145 |
| Scientific notation | 4.7689 × |
47689 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand six hundred and eighty-nine |
| Binary (base 2) | 1011101001001001 |
| Octal (base 8) | 135111 |
| Hexadecimal (base 16) | BA49 |
| Base 3 | 2102102021 |
| As time | 47689 seconds = 13 h 14 min 49 s |
Is 47689 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 1) | 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 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | 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 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47689 a prime number?
No. 47689 = 103 × 463, so it is divisible by 103.
What are the factors of 47689?
1, 103, 463, 47689.
What is 47689 in binary?
1011101001001001 (hexadecimal BA49, octal 135111).
What is the square root of 47689?
About 218.3781.
Is 47689 divisible by 3?
No. Its digits add up to 34, which is not a multiple of 3.
What is special about the number 47689?
47689 is a semiprime: 103 × 463, the product of two primes.