The number 71423
71423 is a composite number with 8 divisors. Its prime factorisation is 11 × 43 × 151. Divisors (8): 1, 11, 43, 151, 473, 1661, 6493, 71423.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 71423: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
71423 is composite. Its prime factorisation is
- 3
The divisors add up to 80256; without 71423 itself that is 8833, so 71423 is deficient (8833 is less than 71423). Euler's totient φ(71423) = 63000 numbers up to 71423 share no factor with it.
- 4
The digits of 71423 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 218 steps to reach 1.
LaTeX source of the formulas on this page
\[ 71423 = 11 \times 43 \times 151 \]
71423 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 80256 |
| Euler totient φ(n) | 63000 |
| Square | 5101244929 |
| Cube | 364346216563967 |
| Square root | 267.250819 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 218 |
| Scientific notation | 7.1423 × |
71423 in other forms
| Form | Value |
|---|---|
| In words | seventy-one thousand four hundred and twenty-three |
| Binary (base 2) | 10001011011111111 |
| Octal (base 8) | 213377 |
| Hexadecimal (base 16) | 116FF |
| Base 3 | 10121222022 |
| As time | 71423 seconds = 19 h 50 min 23 s |
Is 71423 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | 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 2) | 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 7) | 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 3) | A number is divisible by 10 if the last digit is 0. |
| 11 | Yes (71423 ÷ 11 = 6493) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 71423 a prime number?
No. 71423 = 11 × 43 × 151, so it is divisible by 11.
What are the factors of 71423?
1, 11, 43, 151, 473, 1661, 6493, 71423.
What is 71423 in binary?
10001011011111111 (hexadecimal 116FF, octal 213377).
What is the square root of 71423?
About 267.2508.
Is 71423 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 71423?
71423 is a happy number: repeatedly adding the squares of its digits reaches 1.