The number 4985
4985 is a composite number with 4 divisors. Its prime factorisation is 5 × 997. Divisors (4): 1, 5, 997, 4985.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 4985: a semiprime: 5 × 997, the product of two primes.
- 2
4985 is composite. Its prime factorisation is
- 3
The divisors add up to 5988; without 4985 itself that is 1003, so 4985 is deficient (1003 is less than 4985). Euler's totient φ(4985) = 3984 numbers up to 4985 share no factor with it.
- 4
The digits of 4985 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 116 steps to reach 1.
LaTeX source of the formulas on this page
\[ 4985 = 5 \times 997 \]
4985 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 5988 |
| Euler totient φ(n) | 3984 |
| Square | 24850225 |
| Cube | 123878371625 |
| Square root | 70.604532 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 116 |
| Scientific notation | 4.985 × |
4985 in other forms
| Form | Value |
|---|---|
| In words | four thousand nine hundred and eighty-five |
| Binary (base 2) | 1001101111001 |
| Octal (base 8) | 11571 |
| Hexadecimal (base 16) | 1379 |
| Base 3 | 20211122 |
| As time | 4985 seconds = 1 h 23 min 5 s |
Is 4985 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 | No (remainder 2) | 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 | Yes (4985 ÷ 5 = 997) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | 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 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 2) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 4985 a prime number?
No. 4985 = 5 × 997, so it is divisible by 5.
What are the factors of 4985?
1, 5, 997, 4985.
What is 4985 in binary?
1001101111001 (hexadecimal 1379, octal 11571).
What is the square root of 4985?
About 70.6045.
Is 4985 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 4985?
4985 is a semiprime: 5 × 997, the product of two primes.