The number 29809
29809 is a composite number with 4 divisors. Its prime factorisation is 13 × 2293. Divisors (4): 1, 13, 2293, 29809.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 29809: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 13 × 2293, the product of two primes.
- 2
29809 is composite. Its prime factorisation is
- 3
The divisors add up to 32116; without 29809 itself that is 2307, so 29809 is deficient (2307 is less than 29809). Euler's totient φ(29809) = 27504 numbers up to 29809 share no factor with it.
- 4
The digits of 29809 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 41 steps to reach 1.
LaTeX source of the formulas on this page
\[ 29809 = 13 \times 2293 \]
29809 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 32116 |
| Euler totient φ(n) | 27504 |
| Square | 888576481 |
| Cube | 26487576322129 |
| Square root | 172.652831 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 41 |
| Scientific notation | 2.9809 × |
29809 in other forms
| Form | Value |
|---|---|
| In words | twenty-nine thousand eight hundred and nine |
| Binary (base 2) | 111010001110001 |
| Octal (base 8) | 72161 |
| Hexadecimal (base 16) | 7471 |
| Base 3 | 1111220001 |
| As time | 29809 seconds = 8 h 16 min 49 s |
Is 29809 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 1) | 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 10) | 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 29809 a prime number?
No. 29809 = 13 × 2293, so it is divisible by 13.
What are the factors of 29809?
1, 13, 2293, 29809.
What is 29809 in binary?
111010001110001 (hexadecimal 7471, octal 72161).
What is the square root of 29809?
About 172.6528.
Is 29809 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 29809?
29809 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 13 × 2293, the product of two primes.