The number 80042
80042 is a composite number with 8 divisors. Its prime factorisation is 2 × 31 × 1291. Divisors (8): 1, 2, 31, 62, 1291, 2582, 40021, 80042.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
80042 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
80042 is composite. Its prime factorisation is
- 3
The divisors add up to 124032; without 80042 itself that is 43990, so 80042 is deficient (43990 is less than 80042). Euler's totient φ(80042) = 38700 numbers up to 80042 share no factor with it.
- 4
The digits of 80042 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 32 steps to reach 1.
LaTeX source of the formulas on this page
\[ 80042 = 2 \times 31 \times 1291 \]
80042 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 124032 |
| Euler totient φ(n) | 38700 |
| Square | 6406721764 |
| Cube | 512806823434088 |
| Square root | 282.916949 |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 32 |
| Scientific notation | 8.0042 × |
80042 in other forms
| Form | Value |
|---|---|
| In words | eighty thousand and forty-two |
| Binary (base 2) | 10011100010101010 |
| Octal (base 8) | 234252 |
| Hexadecimal (base 16) | 138AA |
| Base 3 | 11001210112 |
| As time | 80042 seconds = 22 h 14 min 2 s |
Is 80042 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (80042 ÷ 2 = 40021) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | 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 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | 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 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 80042 a prime number?
No. 80042 = 2 × 31 × 1291, so it is divisible by 2.
What are the factors of 80042?
1, 2, 31, 62, 1291, 2582, 40021, 80042.
What is 80042 in binary?
10011100010101010 (hexadecimal 138AA, octal 234252).
What is the square root of 80042?
About 282.9169.
Is 80042 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 80042?
It is a composite number with 8 divisors.