The number 16813
16813 is a composite number with 8 divisors. Its prime factorisation is 17 × 23 × 43. Divisors (8): 1, 17, 23, 43, 391, 731, 989, 16813.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
16813 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
16813 is composite. Its prime factorisation is
- 3
The divisors add up to 19008; without 16813 itself that is 2195, so 16813 is deficient (2195 is less than 16813). Euler's totient φ(16813) = 14784 numbers up to 16813 share no factor with it.
- 4
The digits of 16813 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 66 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16813 = 17 \times 23 \times 43 \]
16813 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 19008 |
| Euler totient φ(n) | 14784 |
| Square | 282676969 |
| Cube | 4752647879797 |
| Square root | 129.664953 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 66 |
| Scientific notation | 1.6813 × |
16813 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand eight hundred and thirteen |
| Binary (base 2) | 100000110101101 |
| Octal (base 8) | 40655 |
| Hexadecimal (base 16) | 41AD |
| Base 3 | 212001201 |
| As time | 16813 seconds = 4 h 40 min 13 s |
Is 16813 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 | No (remainder 3) | 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 5) | 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 3) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | 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 16813 a prime number?
No. 16813 = 17 × 23 × 43, so it is divisible by 17.
What are the factors of 16813?
1, 17, 23, 43, 391, 731, 989, 16813.
What is 16813 in binary?
100000110101101 (hexadecimal 41AD, octal 40655).
What is the square root of 16813?
About 129.6650.
Is 16813 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 16813?
It is a composite number with 8 divisors.