The number 79842
79842 is a composite number with 16 divisors. Its prime factorisation is 2 × 3 × 7 × 1901. Divisors (16): 1, 2, 3, 6, 7, 14, 21, 42, 1901, 3802, 5703, 11406, 13307, 26614, 39921, 79842.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
79842 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
79842 is composite. Its prime factorisation is
- 3
The divisors add up to 182592; without 79842 itself that is 102750, so 79842 is abundant (102750 is more than 79842). Euler's totient φ(79842) = 22800 numbers up to 79842 share no factor with it.
- 4
The digits of 79842 add up to 30, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 138 steps to reach 1.
LaTeX source of the formulas on this page
\[ 79842 = 2 \times 3 \times 7 \times 1901 \]
79842 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 182592 |
| Euler totient φ(n) | 22800 |
| Square | 6374744964 |
| Cube | 508972387415688 |
| Square root | 282.563267 |
| Digit sum / digital root | 30 / 3 |
| Collatz steps to 1 | 138 |
| Scientific notation | 7.9842 × |
79842 in other forms
| Form | Value |
|---|---|
| In words | seventy-nine thousand eight hundred and forty-two |
| Binary (base 2) | 10011011111100010 |
| Octal (base 8) | 233742 |
| Hexadecimal (base 16) | 137E2 |
| Base 3 | 11001112010 |
| As time | 79842 seconds = 22 h 10 min 42 s |
Is 79842 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (79842 ÷ 2 = 39921) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (79842 ÷ 3 = 26614) | 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 | Yes (79842 ÷ 6 = 13307) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (79842 ÷ 7 = 11406) | 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 2) | 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 79842 a prime number?
No. 79842 = 2 × 3 × 7 × 1901, so it is divisible by 2.
What are the factors of 79842?
1, 2, 3, 6, 7, 14, 21, 42, 1901, 3802, 5703, 11406, 13307, 26614, 39921, 79842.
What is 79842 in binary?
10011011111100010 (hexadecimal 137E2, octal 233742).
What is the square root of 79842?
About 282.5633.
Is 79842 divisible by 3?
Yes. Its digits add up to 30, a multiple of 3.
What is special about the number 79842?
It is a composite number with 16 divisors.