The number 18017
18017 is a composite number with 4 divisors. Its prime factorisation is 43 × 419. Divisors (4): 1, 43, 419, 18017.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18017: a semiprime: 43 × 419, the product of two primes.
- 2
18017 is composite. Its prime factorisation is
- 3
The divisors add up to 18480; without 18017 itself that is 463, so 18017 is deficient (463 is less than 18017). Euler's totient φ(18017) = 17556 numbers up to 18017 share no factor with it.
- 4
The digits of 18017 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 40 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18017 = 43 \times 419 \]
18017 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 18480 |
| Euler totient φ(n) | 17556 |
| Square | 324612289 |
| Cube | 5848539610913 |
| Square root | 134.227419 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 40 |
| Scientific notation | 1.8017 × |
18017 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand and seventeen |
| Binary (base 2) | 100011001100001 |
| Octal (base 8) | 43141 |
| Hexadecimal (base 16) | 4661 |
| Base 3 | 220201022 |
| As time | 18017 seconds = 5 h 0 min 17 s |
Is 18017 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 2) | 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 6) | 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 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 18017 a prime number?
No. 18017 = 43 × 419, so it is divisible by 43.
What are the factors of 18017?
1, 43, 419, 18017.
What is 18017 in binary?
100011001100001 (hexadecimal 4661, octal 43141).
What is the square root of 18017?
About 134.2274.
Is 18017 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 18017?
18017 is a semiprime: 43 × 419, the product of two primes.