The number 77389
77389 is a composite number with 4 divisors. Its prime factorisation is 13 × 5953. Divisors (4): 1, 13, 5953, 77389.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 77389: a semiprime: 13 × 5953, the product of two primes.
- 2
77389 is composite. Its prime factorisation is
- 3
The divisors add up to 83356; without 77389 itself that is 5967, so 77389 is deficient (5967 is less than 77389). Euler's totient φ(77389) = 71424 numbers up to 77389 share no factor with it.
- 4
The digits of 77389 add up to 34, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 63 steps to reach 1.
LaTeX source of the formulas on this page
\[ 77389 = 13 \times 5953 \]
77389 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 83356 |
| Euler totient φ(n) | 71424 |
| Square | 5989057321 |
| Cube | 463487157014869 |
| Square root | 278.188785 |
| Digit sum / digital root | 34 / 7 |
| Collatz steps to 1 | 63 |
| Scientific notation | 7.7389 × |
77389 in other forms
| Form | Value |
|---|---|
| In words | seventy-seven thousand three hundred and eighty-nine |
| Binary (base 2) | 10010111001001101 |
| Octal (base 8) | 227115 |
| Hexadecimal (base 16) | 12E4D |
| Base 3 | 10221011021 |
| As time | 77389 seconds = 21 h 29 min 49 s |
Is 77389 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 1) | 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 1) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | 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 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 77389 a prime number?
No. 77389 = 13 × 5953, so it is divisible by 13.
What are the factors of 77389?
1, 13, 5953, 77389.
What is 77389 in binary?
10010111001001101 (hexadecimal 12E4D, octal 227115).
What is the square root of 77389?
About 278.1888.
Is 77389 divisible by 3?
No. Its digits add up to 34, which is not a multiple of 3.
What is special about the number 77389?
77389 is a semiprime: 13 × 5953, the product of two primes.