The number 11749
11749 is a composite number with 4 divisors. Its prime factorisation is 31 × 379. Divisors (4): 1, 31, 379, 11749.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 11749: a semiprime: 31 × 379, the product of two primes.
- 2
11749 is composite. Its prime factorisation is
- 3
The divisors add up to 12160; without 11749 itself that is 411, so 11749 is deficient (411 is less than 11749). Euler's totient φ(11749) = 11340 numbers up to 11749 share no factor with it.
- 4
The digits of 11749 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 55 steps to reach 1.
LaTeX source of the formulas on this page
\[ 11749 = 31 \times 379 \]
11749 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 12160 |
| Euler totient φ(n) | 11340 |
| Square | 138039001 |
| Cube | 1621820222749 |
| Square root | 108.392804 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 55 |
| Scientific notation | 1.1749 × |
11749 in other forms
| Form | Value |
|---|---|
| In words | eleven thousand seven hundred and forty-nine |
| Binary (base 2) | 10110111100101 |
| Octal (base 8) | 26745 |
| Hexadecimal (base 16) | 2DE5 |
| Base 3 | 121010011 |
| As time | 11749 seconds = 3 h 15 min 49 s |
Is 11749 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 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 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 1) | 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 11749 a prime number?
No. 11749 = 31 × 379, so it is divisible by 31.
What are the factors of 11749?
1, 31, 379, 11749.
What is 11749 in binary?
10110111100101 (hexadecimal 2DE5, octal 26745).
What is the square root of 11749?
About 108.3928.
Is 11749 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 11749?
11749 is a semiprime: 31 × 379, the product of two primes.