The number 4989
4989 is a composite number with 4 divisors. Its prime factorisation is 3 × 1663. Divisors (4): 1, 3, 1663, 4989.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 4989: a semiprime: 3 × 1663, the product of two primes.
- 2
4989 is composite. Its prime factorisation is
- 3
The divisors add up to 6656; without 4989 itself that is 1667, so 4989 is deficient (1667 is less than 4989). Euler's totient φ(4989) = 3324 numbers up to 4989 share no factor with it.
- 4
The digits of 4989 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 134 steps to reach 1.
LaTeX source of the formulas on this page
\[ 4989 = 3 \times 1663 \]
4989 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 6656 |
| Euler totient φ(n) | 3324 |
| Square | 24890121 |
| Cube | 124176813669 |
| Square root | 70.632854 |
| Digit sum / digital root | 30 / 3 |
| Collatz steps to 1 | 134 |
| Scientific notation | 4.989 × |
4989 in other forms
| Form | Value |
|---|---|
| In words | four thousand nine hundred and eighty-nine |
| Binary (base 2) | 1001101111101 |
| Octal (base 8) | 11575 |
| Hexadecimal (base 16) | 137D |
| Base 3 | 20211210 |
| As time | 4989 seconds = 1 h 23 min 9 s |
Is 4989 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 (4989 ÷ 3 = 1663) | 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 5) | 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 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 6) | 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 4989 a prime number?
No. 4989 = 3 × 1663, so it is divisible by 3.
What are the factors of 4989?
1, 3, 1663, 4989.
What is 4989 in binary?
1001101111101 (hexadecimal 137D, octal 11575).
What is the square root of 4989?
About 70.6329.
Is 4989 divisible by 3?
Yes. Its digits add up to 30, a multiple of 3.
What is special about the number 4989?
4989 is a semiprime: 3 × 1663, the product of two primes.