The number 42909
42909 is a composite number with 4 divisors. Its prime factorisation is 3 × 14303. Divisors (4): 1, 3, 14303, 42909.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42909: a semiprime: 3 × 14303, the product of two primes.
- 2
42909 is composite. Its prime factorisation is
- 3
The divisors add up to 57216; without 42909 itself that is 14307, so 42909 is deficient (14307 is less than 42909). Euler's totient φ(42909) = 28604 numbers up to 42909 share no factor with it.
- 4
The digits of 42909 add up to 24, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42909 = 3 \times 14303 \]
42909 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 57216 |
| Euler totient φ(n) | 28604 |
| Square | 1841182281 |
| Cube | 79003290495429 |
| Square root | 207.144877 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2909 × |
42909 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand nine hundred and nine |
| Binary (base 2) | 1010011110011101 |
| Octal (base 8) | 123635 |
| Hexadecimal (base 16) | A79D |
| Base 3 | 2011212020 |
| As time | 42909 seconds = 11 h 55 min 9 s |
Is 42909 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 | Yes (42909 ÷ 3 = 14303) | 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 3) | 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 6) | 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 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42909 a prime number?
No. 42909 = 3 × 14303, so it is divisible by 3.
What are the factors of 42909?
1, 3, 14303, 42909.
What is 42909 in binary?
1010011110011101 (hexadecimal A79D, octal 123635).
What is the square root of 42909?
About 207.1449.
Is 42909 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 42909?
42909 is a semiprime: 3 × 14303, the product of two primes.