The number 76409
76409 is a composite number with 4 divisors. Its prime factorisation is 109 × 701. Divisors (4): 1, 109, 701, 76409.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 76409: a semiprime: 109 × 701, the product of two primes.
- 2
76409 is composite. Its prime factorisation is
- 3
The divisors add up to 77220; without 76409 itself that is 811, so 76409 is deficient (811 is less than 76409). Euler's totient φ(76409) = 75600 numbers up to 76409 share no factor with it.
- 4
The digits of 76409 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 138 steps to reach 1.
LaTeX source of the formulas on this page
\[ 76409 = 109 \times 701 \]
76409 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 77220 |
| Euler totient φ(n) | 75600 |
| Square | 5838335281 |
| Cube | 446101360485929 |
| Square root | 276.421779 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 138 |
| Scientific notation | 7.6409 × |
76409 in other forms
| Form | Value |
|---|---|
| In words | seventy-six thousand four hundred and nine |
| Binary (base 2) | 10010101001111001 |
| Octal (base 8) | 225171 |
| Hexadecimal (base 16) | 12A79 |
| Base 3 | 10212210222 |
| As time | 76409 seconds = 21 h 13 min 29 s |
Is 76409 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 | No (remainder 2) | 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 5) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | 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 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 76409 a prime number?
No. 76409 = 109 × 701, so it is divisible by 109.
What are the factors of 76409?
1, 109, 701, 76409.
What is 76409 in binary?
10010101001111001 (hexadecimal 12A79, octal 225171).
What is the square root of 76409?
About 276.4218.
Is 76409 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 76409?
76409 is a semiprime: 109 × 701, the product of two primes.