The number 78429
78429 is a composite number with 8 divisors. Its prime factorisation is 3 × 13 × 2011. Divisors (8): 1, 3, 13, 39, 2011, 6033, 26143, 78429.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
78429 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
78429 is composite. Its prime factorisation is
- 3
The divisors add up to 112672; without 78429 itself that is 34243, so 78429 is deficient (34243 is less than 78429). Euler's totient φ(78429) = 48240 numbers up to 78429 share no factor with it.
- 4
The digits of 78429 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
\[ 78429 = 3 \times 13 \times 2011 \]
78429 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 112672 |
| Euler totient φ(n) | 48240 |
| Square | 6151108041 |
| Cube | 482425252547589 |
| Square root | 280.051781 |
| Digit sum / digital root | 30 / 3 |
| Collatz steps to 1 | 138 |
| Scientific notation | 7.8429 × |
78429 in other forms
| Form | Value |
|---|---|
| In words | seventy-eight thousand four hundred and twenty-nine |
| Binary (base 2) | 10011001001011101 |
| Octal (base 8) | 231135 |
| Hexadecimal (base 16) | 1325D |
| Base 3 | 10222120210 |
| As time | 78429 seconds = 21 h 47 min 9 s |
Is 78429 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 (78429 ÷ 3 = 26143) | 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 5) | 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 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 78429 a prime number?
No. 78429 = 3 × 13 × 2011, so it is divisible by 3.
What are the factors of 78429?
1, 3, 13, 39, 2011, 6033, 26143, 78429.
What is 78429 in binary?
10011001001011101 (hexadecimal 1325D, octal 231135).
What is the square root of 78429?
About 280.0518.
Is 78429 divisible by 3?
Yes. Its digits add up to 30, a multiple of 3.
What is special about the number 78429?
It is a composite number with 8 divisors.