The number 18182
18182 is a composite number with 4 divisors. Its prime factorisation is 2 × 9091. Divisors (4): 1, 2, 9091, 18182.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18182: a semiprime: 2 × 9091, the product of two primes.
- 2
18182 is composite. Its prime factorisation is
- 3
The divisors add up to 27276; without 18182 itself that is 9094, so 18182 is deficient (9094 is less than 18182). Euler's totient φ(18182) = 9090 numbers up to 18182 share no factor with it.
- 4
The digits of 18182 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 141 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18182 = 2 \times 9091 \]
18182 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 27276 |
| Euler totient φ(n) | 9090 |
| Square | 330585124 |
| Cube | 6010698724568 |
| Square root | 134.840647 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 141 |
| Scientific notation | 1.8182 × |
18182 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand one hundred and eighty-two |
| Binary (base 2) | 100011100000110 |
| Octal (base 8) | 43406 |
| Hexadecimal (base 16) | 4706 |
| Base 3 | 220221102 |
| As time | 18182 seconds = 5 h 3 min 2 s |
Is 18182 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (18182 ÷ 2 = 9091) | 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 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 2) | 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 2) | 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 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 18182 a prime number?
No. 18182 = 2 × 9091, so it is divisible by 2.
What are the factors of 18182?
1, 2, 9091, 18182.
What is 18182 in binary?
100011100000110 (hexadecimal 4706, octal 43406).
What is the square root of 18182?
About 134.8406.
Is 18182 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 18182?
18182 is a semiprime: 2 × 9091, the product of two primes.