The number 23990
23990 is a composite number with 8 divisors. Its prime factorisation is 2 × 5 × 2399. Divisors (8): 1, 2, 5, 10, 2399, 4798, 11995, 23990.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
23990 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
23990 is composite. Its prime factorisation is
- 3
The divisors add up to 43200; without 23990 itself that is 19210, so 23990 is deficient (19210 is less than 23990). Euler's totient φ(23990) = 9592 numbers up to 23990 share no factor with it.
- 4
The digits of 23990 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 188 steps to reach 1.
LaTeX source of the formulas on this page
\[ 23990 = 2 \times 5 \times 2399 \]
23990 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 43200 |
| Euler totient φ(n) | 9592 |
| Square | 575520100 |
| Cube | 13806727199000 |
| Square root | 154.887056 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 188 |
| Scientific notation | 2.399 × |
23990 in other forms
| Form | Value |
|---|---|
| In words | twenty-three thousand nine hundred and ninety |
| Binary (base 2) | 101110110110110 |
| Octal (base 8) | 56666 |
| Hexadecimal (base 16) | 5DB6 |
| Base 3 | 1012220112 |
| As time | 23990 seconds = 6 h 39 min 50 s |
Is 23990 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (23990 ÷ 2 = 11995) | 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 (23990 ÷ 5 = 4798) | 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 1) | 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 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (23990 ÷ 10 = 2399) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 10) | 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 23990 a prime number?
No. 23990 = 2 × 5 × 2399, so it is divisible by 2.
What are the factors of 23990?
1, 2, 5, 10, 2399, 4798, 11995, 23990.
What is 23990 in binary?
101110110110110 (hexadecimal 5DB6, octal 56666).
What is the square root of 23990?
About 154.8871.
Is 23990 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 23990?
It is a composite number with 8 divisors.