The number 42729
42729 is a composite number with 4 divisors. Its prime factorisation is 3 × 14243. Divisors (4): 1, 3, 14243, 42729.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42729: a semiprime: 3 × 14243, the product of two primes.
- 2
42729 is composite. Its prime factorisation is
- 3
The divisors add up to 56976; without 42729 itself that is 14247, so 42729 is deficient (14247 is less than 42729). Euler's totient φ(42729) = 28484 numbers up to 42729 share no factor with it.
- 4
The digits of 42729 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 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42729 = 3 \times 14243 \]
42729 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 56976 |
| Euler totient φ(n) | 28484 |
| Square | 1825767441 |
| Cube | 78013216986489 |
| Square root | 206.709942 |
| Digit sum / digital root | 24 / 6 |
| Collatz steps to 1 | 75 |
| Scientific notation | 4.2729 × |
42729 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand seven hundred and twenty-nine |
| Binary (base 2) | 1010011011101001 |
| Octal (base 8) | 123351 |
| Hexadecimal (base 16) | A6E9 |
| Base 3 | 2011121120 |
| As time | 42729 seconds = 11 h 52 min 9 s |
Is 42729 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 (42729 ÷ 3 = 14243) | 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 1) | 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 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 5) | 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 42729 a prime number?
No. 42729 = 3 × 14243, so it is divisible by 3.
What are the factors of 42729?
1, 3, 14243, 42729.
What is 42729 in binary?
1010011011101001 (hexadecimal A6E9, octal 123351).
What is the square root of 42729?
About 206.7099.
Is 42729 divisible by 3?
Yes. Its digits add up to 24, a multiple of 3.
What is special about the number 42729?
42729 is a semiprime: 3 × 14243, the product of two primes.