The number 47749
47749 is a composite number with 4 divisors. Its prime factorisation is 13 × 3673. Divisors (4): 1, 13, 3673, 47749.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 47749: a semiprime: 13 × 3673, the product of two primes.
- 2
47749 is composite. Its prime factorisation is
- 3
The divisors add up to 51436; without 47749 itself that is 3687, so 47749 is deficient (3687 is less than 47749). Euler's totient φ(47749) = 44064 numbers up to 47749 share no factor with it.
- 4
The digits of 47749 add up to 31, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 145 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47749 = 13 \times 3673 \]
47749 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 51436 |
| Euler totient φ(n) | 44064 |
| Square | 2279967001 |
| Cube | 108866144330749 |
| Square root | 218.515446 |
| Digit sum / digital root | 31 / 4 |
| Collatz steps to 1 | 145 |
| Scientific notation | 4.7749 × |
47749 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand seven hundred and forty-nine |
| Binary (base 2) | 1011101010000101 |
| Octal (base 8) | 135205 |
| Hexadecimal (base 16) | BA85 |
| Base 3 | 2102111111 |
| As time | 47749 seconds = 13 h 15 min 49 s |
Is 47749 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 2) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | 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 9) | 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 47749 a prime number?
No. 47749 = 13 × 3673, so it is divisible by 13.
What are the factors of 47749?
1, 13, 3673, 47749.
What is 47749 in binary?
1011101010000101 (hexadecimal BA85, octal 135205).
What is the square root of 47749?
About 218.5154.
Is 47749 divisible by 3?
No. Its digits add up to 31, which is not a multiple of 3.
What is special about the number 47749?
47749 is a semiprime: 13 × 3673, the product of two primes.