The number 74749
74749 is a composite number with 4 divisors. Its prime factorisation is 17 × 4397. Divisors (4): 1, 17, 4397, 74749.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 74749: a semiprime: 17 × 4397, the product of two primes.
- 2
74749 is composite. Its prime factorisation is
- 3
The divisors add up to 79164; without 74749 itself that is 4415, so 74749 is deficient (4415 is less than 74749). Euler's totient φ(74749) = 70336 numbers up to 74749 share no factor with it.
- 4
The digits of 74749 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 63 steps to reach 1.
LaTeX source of the formulas on this page
\[ 74749 = 17 \times 4397 \]
74749 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 79164 |
| Euler totient φ(n) | 70336 |
| Square | 5587413001 |
| Cube | 417653534411749 |
| Square root | 273.402633 |
| Digit sum / digital root | 31 / 4 |
| Collatz steps to 1 | 63 |
| Scientific notation | 7.4749 × |
74749 in other forms
| Form | Value |
|---|---|
| In words | seventy-four thousand seven hundred and forty-nine |
| Binary (base 2) | 10010001111111101 |
| Octal (base 8) | 221775 |
| Hexadecimal (base 16) | 123FD |
| Base 3 | 10210112111 |
| As time | 74749 seconds = 20 h 45 min 49 s |
Is 74749 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 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 74749 a prime number?
No. 74749 = 17 × 4397, so it is divisible by 17.
What are the factors of 74749?
1, 17, 4397, 74749.
What is 74749 in binary?
10010001111111101 (hexadecimal 123FD, octal 221775).
What is the square root of 74749?
About 273.4026.
Is 74749 divisible by 3?
No. Its digits add up to 31, which is not a multiple of 3.
What is special about the number 74749?
74749 is a semiprime: 17 × 4397, the product of two primes.