The number 79742
79742 is a composite number with 8 divisors. Its prime factorisation is 2 × 13 × 3067. Divisors (8): 1, 2, 13, 26, 3067, 6134, 39871, 79742.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
79742 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
79742 is composite. Its prime factorisation is
- 3
The divisors add up to 128856; without 79742 itself that is 49114, so 79742 is deficient (49114 is less than 79742). Euler's totient φ(79742) = 36792 numbers up to 79742 share no factor with it.
- 4
The digits of 79742 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 182 steps to reach 1.
LaTeX source of the formulas on this page
\[ 79742 = 2 \times 13 \times 3067 \]
79742 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 128856 |
| Euler totient φ(n) | 36792 |
| Square | 6358786564 |
| Cube | 507062358186488 |
| Square root | 282.386260 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 182 |
| Scientific notation | 7.9742 × |
79742 in other forms
| Form | Value |
|---|---|
| In words | seventy-nine thousand seven hundred and forty-two |
| Binary (base 2) | 10011011101111110 |
| Octal (base 8) | 233576 |
| Hexadecimal (base 16) | 1377E |
| Base 3 | 11001101102 |
| As time | 79742 seconds = 22 h 9 min 2 s |
Is 79742 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (79742 ÷ 2 = 39871) | 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 5) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | 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 3) | 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 79742 a prime number?
No. 79742 = 2 × 13 × 3067, so it is divisible by 2.
What are the factors of 79742?
1, 2, 13, 26, 3067, 6134, 39871, 79742.
What is 79742 in binary?
10011011101111110 (hexadecimal 1377E, octal 233576).
What is the square root of 79742?
About 282.3863.
Is 79742 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 79742?
It is a composite number with 8 divisors.