The number 4389
4389 is a composite number with 16 divisors. Its prime factorisation is 3 × 7 × 11 × 19. Divisors (16): 1, 3, 7, 11, 19, 21, 33, 57, 77, 133, 209, 231, 399, 627, 1463, 4389.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
4389 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
4389 is composite. Its prime factorisation is
- 3
The divisors add up to 7680; without 4389 itself that is 3291, so 4389 is deficient (3291 is less than 4389). Euler's totient φ(4389) = 2160 numbers up to 4389 share no factor with it.
- 4
The digits of 4389 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 139 steps to reach 1.
LaTeX source of the formulas on this page
\[ 4389 = 3 \times 7 \times 11 \times 19 \]
4389 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 7680 |
| Euler totient φ(n) | 2160 |
| Square | 19263321 |
| Cube | 84546715869 |
| Square root | 66.249528 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 139 |
| Scientific notation | 4.389 × |
4389 in other forms
| Form | Value |
|---|---|
| In words | four thousand three hundred and eighty-nine |
| Binary (base 2) | 1000100100101 |
| Octal (base 8) | 10445 |
| Hexadecimal (base 16) | 1125 |
| Base 3 | 20000120 |
| As time | 4389 seconds = 1 h 13 min 9 s |
Is 4389 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 (4389 ÷ 3 = 1463) | 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 | Yes (4389 ÷ 7 = 627) | 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 5) | 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 | Yes (4389 ÷ 11 = 399) | 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 4389 a prime number?
No. 4389 = 3 × 7 × 11 × 19, so it is divisible by 3.
What are the factors of 4389?
1, 3, 7, 11, 19, 21, 33, 57, 77, 133, 209, 231, 399, 627, 1463, 4389.
What is 4389 in binary?
1000100100101 (hexadecimal 1125, octal 10445).
What is the square root of 4389?
About 66.2495.
Is 4389 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 4389?
It is a composite number with 16 divisors.