The number 27123
27123 is a composite number with 4 divisors. Its prime factorisation is 3 × 9041. Divisors (4): 1, 3, 9041, 27123.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 27123: a semiprime: 3 × 9041, the product of two primes.
- 2
27123 is composite. Its prime factorisation is
- 3
The divisors add up to 36168; without 27123 itself that is 9045, so 27123 is deficient (9045 is less than 27123). Euler's totient φ(27123) = 18080 numbers up to 27123 share no factor with it.
- 4
The digits of 27123 add up to 15, and repeating that until one digit is left gives the digital root 6. The Collatz sequence (halve if even, else 3n+1) takes 90 steps to reach 1.
LaTeX source of the formulas on this page
\[ 27123 = 3 \times 9041 \]
27123 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 36168 |
| Euler totient φ(n) | 18080 |
| Square | 735657129 |
| Cube | 19953228309867 |
| Square root | 164.690619 |
| Digit sum / digital root | 15 / 6 |
| Collatz steps to 1 | 90 |
| Scientific notation | 2.7123 × |
27123 in other forms
| Form | Value |
|---|---|
| In words | twenty-seven thousand one hundred and twenty-three |
| Binary (base 2) | 110100111110011 |
| Octal (base 8) | 64763 |
| Hexadecimal (base 16) | 69F3 |
| Base 3 | 1101012120 |
| As time | 27123 seconds = 7 h 32 min 3 s |
Is 27123 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 | Yes (27123 ÷ 3 = 9041) | 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 3) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | 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 6) | 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 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 27123 a prime number?
No. 27123 = 3 × 9041, so it is divisible by 3.
What are the factors of 27123?
1, 3, 9041, 27123.
What is 27123 in binary?
110100111110011 (hexadecimal 69F3, octal 64763).
What is the square root of 27123?
About 164.6906.
Is 27123 divisible by 3?
Yes. Its digits add up to 15, a multiple of 3.
What is special about the number 27123?
27123 is a semiprime: 3 × 9041, the product of two primes.