The number 18742
18742 is a composite number with 4 divisors. Its prime factorisation is 2 × 9371. Divisors (4): 1, 2, 9371, 18742.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18742: a semiprime: 2 × 9371, the product of two primes.
- 2
18742 is composite. Its prime factorisation is
- 3
The divisors add up to 28116; without 18742 itself that is 9374, so 18742 is deficient (9374 is less than 18742). Euler's totient φ(18742) = 9370 numbers up to 18742 share no factor with it.
- 4
The digits of 18742 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 185 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18742 = 2 \times 9371 \]
18742 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 28116 |
| Euler totient φ(n) | 9370 |
| Square | 351262564 |
| Cube | 6583362974488 |
| Square root | 136.901424 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 185 |
| Scientific notation | 1.8742 × |
18742 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand seven hundred and forty-two |
| Binary (base 2) | 100100100110110 |
| Octal (base 8) | 44466 |
| Hexadecimal (base 16) | 4936 |
| Base 3 | 221201011 |
| As time | 18742 seconds = 5 h 12 min 22 s |
Is 18742 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (18742 ÷ 2 = 9371) | 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 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | 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 6) | 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 2) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 18742 a prime number?
No. 18742 = 2 × 9371, so it is divisible by 2.
What are the factors of 18742?
1, 2, 9371, 18742.
What is 18742 in binary?
100100100110110 (hexadecimal 4936, octal 44466).
What is the square root of 18742?
About 136.9014.
Is 18742 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 18742?
18742 is a semiprime: 2 × 9371, the product of two primes.