The number 16243
16243 is a composite number with 4 divisors. Its prime factorisation is 37 × 439. Divisors (4): 1, 37, 439, 16243.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 16243: a semiprime: 37 × 439, the product of two primes.
- 2
16243 is composite. Its prime factorisation is
- 3
The divisors add up to 16720; without 16243 itself that is 477, so 16243 is deficient (477 is less than 16243). Euler's totient φ(16243) = 15768 numbers up to 16243 share no factor with it.
- 4
The digits of 16243 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 40 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16243 = 37 \times 439 \]
16243 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 16720 |
| Euler totient φ(n) | 15768 |
| Square | 263835049 |
| Cube | 4285472700907 |
| Square root | 127.448029 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 40 |
| Scientific notation | 1.6243 × |
16243 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand two hundred and forty-three |
| Binary (base 2) | 11111101110011 |
| Octal (base 8) | 37563 |
| Hexadecimal (base 16) | 3F73 |
| Base 3 | 211021121 |
| As time | 16243 seconds = 4 h 30 min 43 s |
Is 16243 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 3) | 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 7) | 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 16243 a prime number?
No. 16243 = 37 × 439, so it is divisible by 37.
What are the factors of 16243?
1, 37, 439, 16243.
What is 16243 in binary?
11111101110011 (hexadecimal 3F73, octal 37563).
What is the square root of 16243?
About 127.4480.
Is 16243 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 16243?
16243 is a semiprime: 37 × 439, the product of two primes.