The number 18155
18155 is a composite number with 4 divisors. Its prime factorisation is 5 × 3631. Divisors (4): 1, 5, 3631, 18155.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18155: a semiprime: 5 × 3631, the product of two primes.
- 2
18155 is composite. Its prime factorisation is
- 3
The divisors add up to 21792; without 18155 itself that is 3637, so 18155 is deficient (3637 is less than 18155). Euler's totient φ(18155) = 14520 numbers up to 18155 share no factor with it.
- 4
The digits of 18155 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 185 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18155 = 5 \times 3631 \]
18155 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 21792 |
| Euler totient φ(n) | 14520 |
| Square | 329604025 |
| Cube | 5983961073875 |
| Square root | 134.740491 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 185 |
| Scientific notation | 1.8155 × |
18155 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand one hundred and fifty-five |
| Binary (base 2) | 100011011101011 |
| Octal (base 8) | 43353 |
| Hexadecimal (base 16) | 46EB |
| Base 3 | 220220102 |
| As time | 18155 seconds = 5 h 2 min 35 s |
Is 18155 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (18155 ÷ 5 = 3631) | 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 4) | 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 18155 a prime number?
No. 18155 = 5 × 3631, so it is divisible by 5.
What are the factors of 18155?
1, 5, 3631, 18155.
What is 18155 in binary?
100011011101011 (hexadecimal 46EB, octal 43353).
What is the square root of 18155?
About 134.7405.
Is 18155 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 18155?
18155 is a semiprime: 5 × 3631, the product of two primes.