The number 12489
12489 is a composite number with 8 divisors. Its prime factorisation is 3 × 23 × 181. Divisors (8): 1, 3, 23, 69, 181, 543, 4163, 12489.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
12489 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
12489 is composite. Its prime factorisation is
- 3
The divisors add up to 17472; without 12489 itself that is 4983, so 12489 is deficient (4983 is less than 12489). Euler's totient φ(12489) = 7920 numbers up to 12489 share no factor with it.
- 4
The digits of 12489 add up to 24, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 63 steps to reach 1.
LaTeX source of the formulas on this page
\[ 12489 = 3 \times 23 \times 181 \]
12489 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 17472 |
| Euler totient φ(n) | 7920 |
| Square | 155975121 |
| Cube | 1947973286169 |
| Square root | 111.754195 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 63 |
| Scientific notation | 1.2489 × |
12489 in other forms
| Form | Value |
|---|---|
| In words | twelve thousand four hundred and eighty-nine |
| Binary (base 2) | 11000011001001 |
| Octal (base 8) | 30311 |
| Hexadecimal (base 16) | 30C9 |
| Base 3 | 122010120 |
| As time | 12489 seconds = 3 h 28 min 9 s |
Is 12489 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 (12489 ÷ 3 = 4163) | 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 1) | 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 6) | 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 4) | 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 12489 a prime number?
No. 12489 = 3 × 23 × 181, so it is divisible by 3.
What are the factors of 12489?
1, 3, 23, 69, 181, 543, 4163, 12489.
What is 12489 in binary?
11000011001001 (hexadecimal 30C9, octal 30311).
What is the square root of 12489?
About 111.7542.
Is 12489 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 12489?
It is a composite number with 8 divisors.