The number 18489
18489 is a composite number with 4 divisors. Its prime factorisation is 3 × 6163. Divisors (4): 1, 3, 6163, 18489.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18489: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 3 × 6163, the product of two primes.
- 2
18489 is composite. Its prime factorisation is
- 3
The divisors add up to 24656; without 18489 itself that is 6167, so 18489 is deficient (6167 is less than 18489). Euler's totient φ(18489) = 12324 numbers up to 18489 share no factor with it.
- 4
The digits of 18489 add up to 30, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 154 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18489 = 3 \times 6163 \]
18489 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 24656 |
| Euler totient φ(n) | 12324 |
| Square | 341843121 |
| Cube | 6320337464169 |
| Square root | 135.974262 |
| Digit sum / digital root | 30 / 3 |
| Collatz steps to 1 | 154 |
| Scientific notation | 1.8489 × |
18489 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand four hundred and eighty-nine |
| Binary (base 2) | 100100000111001 |
| Octal (base 8) | 44071 |
| Hexadecimal (base 16) | 4839 |
| Base 3 | 221100210 |
| As time | 18489 seconds = 5 h 8 min 9 s |
Is 18489 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 | Yes (18489 ÷ 3 = 6163) | 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 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | 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 3) | 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 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 18489 a prime number?
No. 18489 = 3 × 6163, so it is divisible by 3.
What are the factors of 18489?
1, 3, 6163, 18489.
What is 18489 in binary?
100100000111001 (hexadecimal 4839, octal 44071).
What is the square root of 18489?
About 135.9743.
Is 18489 divisible by 3?
Yes. Its digits add up to 30, a multiple of 3.
What is special about the number 18489?
18489 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 3 × 6163, the product of two primes.