The number 71397
71397 is a composite number with 6 divisors. Its prime factorisation is × 7933. Divisors (6): 1, 3, 9, 7933, 23799, 71397.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
71397 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
71397 is composite. Its prime factorisation is
- 3
The divisors add up to 103142; without 71397 itself that is 31745, so 71397 is deficient (31745 is less than 71397). Euler's totient φ(71397) = 47592 numbers up to 71397 share no factor with it.
- 4
The digits of 71397 add up to 27, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 143 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71397 = 3^{2} \times 7933 \]71397 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 103142 |
| Euler totient φ(n) | 47592 |
| Square | 5097531609 |
| Cube | 363948464287773 |
| Square root | 267.202171 (= 3√7933) |
| Digit sum / digital root | 27 / 9 |
| Collatz steps to 1 | 143 |
| Scientific notation | 7.1397 × |
71397 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand three hundred and ninety-seven |
| Binary (base 2) | 10001011011100101 |
| Octal (base 8) | 213345 |
| Hexadecimal (base 16) | 116E5 |
| Base 3 | 10121221100 |
| As time | 71397 seconds = 19 h 49 min 57 s |
Is 71397 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 (71397 ÷ 3 = 23799) | 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 2) | 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 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 | Yes (71397 ÷ 9 = 7933) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | 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 71397 a prime number?
No. 71397 = × 7933, so it is divisible by 3.
What are the factors of 71397?
1, 3, 9, 7933, 23799, 71397.
What is 71397 in binary?
10001011011100101 (hexadecimal 116E5, octal 213345).
What is the square root of 71397?
About 267.2022, exactly 3√7933.
Is 71397 divisible by 3?
Yes. Its digits add up to 27, a multiple of 3.
What is special about the number 71397?
It is a composite number with 6 divisors.