The number 16123
16123 is a composite number with 4 divisors. Its prime factorisation is 23 × 701. Divisors (4): 1, 23, 701, 16123.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 16123: a semiprime: 23 × 701, the product of two primes.
- 2
16123 is composite. Its prime factorisation is
- 3
The divisors add up to 16848; without 16123 itself that is 725, so 16123 is deficient (725 is less than 16123). Euler's totient φ(16123) = 15400 numbers up to 16123 share no factor with it.
- 4
The digits of 16123 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 190 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16123 = 23 \times 701 \]
16123 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 16848 |
| Euler totient φ(n) | 15400 |
| Square | 259951129 |
| Cube | 4191192052867 |
| Square root | 126.976376 |
| Digit sum / digital root | 13 / 4 |
| Collatz steps to 1 | 190 |
| Scientific notation | 1.6123 × |
16123 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand one hundred and twenty-three |
| Binary (base 2) | 11111011111011 |
| Octal (base 8) | 37373 |
| Hexadecimal (base 16) | 3EFB |
| Base 3 | 211010011 |
| As time | 16123 seconds = 4 h 28 min 43 s |
Is 16123 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 | 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 3) | 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 8) | 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 16123 a prime number?
No. 16123 = 23 × 701, so it is divisible by 23.
What are the factors of 16123?
1, 23, 701, 16123.
What is 16123 in binary?
11111011111011 (hexadecimal 3EFB, octal 37373).
What is the square root of 16123?
About 126.9764.
Is 16123 divisible by 3?
No. Its digits add up to 13, which is not a multiple of 3.
What is special about the number 16123?
16123 is a semiprime: 23 × 701, the product of two primes.