The number 47729
47729 is a composite number with 4 divisors. Its prime factorisation is 11 × 4339. Divisors (4): 1, 11, 4339, 47729.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47729: a semiprime: 11 × 4339, the product of two primes.
- 2
47729 is composite. Its prime factorisation is
- 3
The divisors add up to 52080; without 47729 itself that is 4351, so 47729 is deficient (4351 is less than 47729). Euler's totient φ(47729) = 43380 numbers up to 47729 share no factor with it.
- 4
The digits of 47729 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 96 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47729 = 11 \times 4339 \]
47729 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 52080 |
| Euler totient φ(n) | 43380 |
| Square | 2278057441 |
| Cube | 108729403601489 |
| Square root | 218.469678 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 96 |
| Scientific notation | 4.7729 × |
47729 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand seven hundred and twenty-nine |
| Binary (base 2) | 1011101001110001 |
| Octal (base 8) | 135161 |
| Hexadecimal (base 16) | BA71 |
| Base 3 | 2102110202 |
| As time | 47729 seconds = 13 h 15 min 29 s |
Is 47729 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 4) | 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 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 1) | 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 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (47729 ÷ 11 = 4339) | 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 47729 a prime number?
No. 47729 = 11 × 4339, so it is divisible by 11.
What are the factors of 47729?
1, 11, 4339, 47729.
What is 47729 in binary?
1011101001110001 (hexadecimal BA71, octal 135161).
What is the square root of 47729?
About 218.4697.
Is 47729 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 47729?
47729 is a semiprime: 11 × 4339, the product of two primes.