The number 31423
31423 is a composite number with 6 divisors. Its prime factorisation is 7 Ć . Divisors (6): 1, 7, 67, 469, 4489, 31423.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
31423 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
31423 is composite. Its prime factorisation is
- 3
The divisors add up to 36456; without 31423 itself that is 5033, so 31423 is deficient (5033 is less than 31423). Euler's totient Ļ(31423) = 26532 numbers up to 31423 share no factor with it.
- 4
The digits of 31423 add up to 13, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 108 steps to reach 1.
LaTeX source of the formulas on this page
\[ 31423 = 7 \times 67^{2} \]31423 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 36456 |
| Euler totient Ļ(n) | 26532 |
| Square | 987404929 |
| Cube | 31027225083967 |
| Square root | 177.265338 (= 67ā7) |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 108 |
| Scientific notation | 3.1423 Ć |
31423 in other forms
| Form | Value |
|---|---|
| In words | thirty-one thousand four hundred and twenty-three |
| Binary (base 2) | 111101010111111 |
| Octal (base 8) | 75277 |
| Hexadecimal (base 16) | 7ABF |
| Base 3 | 1121002211 |
| As time | 31423 seconds = 8 h 43 min 43 s |
Is 31423 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 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 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (31423 Ć· 7 = 4489) | 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 4) | 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 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 31423 a prime number?
No. 31423 = 7 Ć , so it is divisible by 7.
What are the factors of 31423?
1, 7, 67, 469, 4489, 31423.
What is 31423 in binary?
111101010111111 (hexadecimal 7ABF, octal 75277).
What is the square root of 31423?
About 177.2653, exactly 67ā7.
Is 31423 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 31423?
It is a composite number with 6 divisors.