The number 6985
6985 is a composite number with 8 divisors. Its prime factorisation is 5 × 11 × 127. Divisors (8): 1, 5, 11, 55, 127, 635, 1397, 6985.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
6985 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
6985 is composite. Its prime factorisation is
- 3
The divisors add up to 9216; without 6985 itself that is 2231, so 6985 is deficient (2231 is less than 6985). Euler's totient φ(6985) = 5040 numbers up to 6985 share no factor with it.
- 4
The digits of 6985 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 106 steps to reach 1.
LaTeX source of the formulas on this page
\[ 6985 = 5 \times 11 \times 127 \]
6985 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 9216 |
| Euler totient φ(n) | 5040 |
| Square | 48790225 |
| Cube | 340799721625 |
| Square root | 83.576312 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 106 |
| Scientific notation | 6.985 × |
6985 in other forms
| Form | Value |
|---|---|
| In words | six thousand nine hundred and eighty-five |
| Binary (base 2) | 1101101001001 |
| Octal (base 8) | 15511 |
| Hexadecimal (base 16) | 1B49 |
| Base 3 | 100120201 |
| As time | 6985 seconds = 1 h 56 min 25 s |
Is 6985 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 1) | 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 (6985 ÷ 5 = 1397) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 6) | 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 1) | 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 | Yes (6985 ÷ 11 = 635) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 6985 a prime number?
No. 6985 = 5 × 11 × 127, so it is divisible by 5.
What are the factors of 6985?
1, 5, 11, 55, 127, 635, 1397, 6985.
What is 6985 in binary?
1101101001001 (hexadecimal 1B49, octal 15511).
What is the square root of 6985?
About 83.5763.
Is 6985 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 6985?
It is a composite number with 8 divisors.