The number 8809
8809 is a composite number with 4 divisors. Its prime factorisation is 23 × 383. Divisors (4): 1, 23, 383, 8809.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 8809: a semiprime: 23 × 383, the product of two primes.
- 2
8809 is composite. Its prime factorisation is
- 3
The divisors add up to 9216; without 8809 itself that is 407, so 8809 is deficient (407 is less than 8809). Euler's totient φ(8809) = 8404 numbers up to 8809 share no factor with it.
- 4
The digits of 8809 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 78 steps to reach 1.
LaTeX source of the formulas on this page
\[ 8809 = 23 \times 383 \]
8809 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 9216 |
| Euler totient φ(n) | 8404 |
| Square | 77598481 |
| Cube | 683565019129 |
| Square root | 93.856273 |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 78 |
| Scientific notation | 8.809 × |
8809 in other forms
| Form | Value |
|---|---|
| In words | eight thousand eight hundred and nine |
| Binary (base 2) | 10001001101001 |
| Octal (base 8) | 21151 |
| Hexadecimal (base 16) | 2269 |
| Base 3 | 110002021 |
| As time | 8809 seconds = 2 h 26 min 49 s |
Is 8809 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 4) | 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 3) | 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 7) | 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 9) | 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 8809 a prime number?
No. 8809 = 23 × 383, so it is divisible by 23.
What are the factors of 8809?
1, 23, 383, 8809.
What is 8809 in binary?
10001001101001 (hexadecimal 2269, octal 21151).
What is the square root of 8809?
About 93.8563.
Is 8809 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 8809?
8809 is a semiprime: 23 × 383, the product of two primes.