The number 81426
81426 is a composite number with 16 divisors. Its prime factorisation is 2 × 3 × 41 × 331. Divisors (16): 1, 2, 3, 6, 41, 82, 123, 246, 331, 662, 993, 1986, 13571, 27142, 40713, 81426.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
81426 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
81426 is composite. Its prime factorisation is
- 3
The divisors add up to 167328; without 81426 itself that is 85902, so 81426 is abundant (85902 is more than 81426). Euler's totient φ(81426) = 26400 numbers up to 81426 share no factor with it.
- 4
The digits of 81426 add up to 21, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 195 steps to reach 1.
LaTeX source of the formulas on this page
\[ 81426 = 2 \times 3 \times 41 \times 331 \]
81426 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 167328 |
| Euler totient φ(n) | 26400 |
| Square | 6630193476 |
| Cube | 539870133976776 |
| Square root | 285.352414 |
| Digit sum / digital root | 21 / 3 |
| Collatz steps to 1 | 195 |
| Scientific notation | 8.1426 × |
81426 in other forms
| Form | Value |
|---|---|
| In words | eighty-one thousand four hundred and twenty-six |
| Binary (base 2) | 10011111000010010 |
| Octal (base 8) | 237022 |
| Hexadecimal (base 16) | 13E12 |
| Base 3 | 11010200210 |
| As time | 81426 seconds = 22 h 37 min 6 s |
Is 81426 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (81426 ÷ 2 = 40713) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (81426 ÷ 3 = 27142) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 1) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | Yes (81426 ÷ 6 = 13571) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 3) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 6) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 6) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 81426 a prime number?
No. 81426 = 2 × 3 × 41 × 331, so it is divisible by 2.
What are the factors of 81426?
1, 2, 3, 6, 41, 82, 123, 246, 331, 662, 993, 1986, 13571, 27142, 40713, 81426.
What is 81426 in binary?
10011111000010010 (hexadecimal 13E12, octal 237022).
What is the square root of 81426?
About 285.3524.
Is 81426 divisible by 3?
Yes. Its digits add up to 21, a multiple of 3.
What is special about the number 81426?
It is a composite number with 16 divisors.