The number 71390
71390 is a composite number with 24 divisors. Its prime factorisation is 2 × 5 × × 59. Divisors (24): 1, 2, 5, 10, 11, 22, 55, 59, 110, 118, 121, 242, 295, 590, 605, 649 … 71390.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
71390 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
71390 is composite. Its prime factorisation is
- 3
The divisors add up to 143640; without 71390 itself that is 72250, so 71390 is abundant (72250 is more than 71390). Euler's totient φ(71390) = 25520 numbers up to 71390 share no factor with it.
- 4
The digits of 71390 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 125 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71390 = 2 \times 5 \times 11^{2} \times 59 \]71390 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 24 |
| Sum of divisors | 143640 |
| Euler totient φ(n) | 25520 |
| Square | 5096532100 |
| Cube | 363841426619000 |
| Square root | 267.189072 (= 11√590) |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 125 |
| Scientific notation | 7.139 × |
71390 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand three hundred and ninety |
| Binary (base 2) | 10001011011011110 |
| Octal (base 8) | 213336 |
| Hexadecimal (base 16) | 116DE |
| Base 3 | 10121221002 |
| As time | 71390 seconds = 19 h 49 min 50 s |
Is 71390 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (71390 ÷ 2 = 35695) | 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 | Yes (71390 ÷ 5 = 14278) | 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 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 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 | Yes (71390 ÷ 10 = 7139) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (71390 ÷ 11 = 6490) | 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 71390 a prime number?
No. 71390 = 2 × 5 × × 59, so it is divisible by 2.
What are the factors of 71390?
1, 2, 5, 10, 11, 22, 55, 59, 110, 118, 121, 242, 295, 590, 605, 649, 1210, 1298, 3245, 6490, 7139, 14278, 35695, 71390.
What is 71390 in binary?
10001011011011110 (hexadecimal 116DE, octal 213336).
What is the square root of 71390?
About 267.1891, exactly 11√590.
Is 71390 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 71390?
It is a composite number with 24 divisors.