The number 16442
16442 is a composite number with 4 divisors. Its prime factorisation is 2 × 8221. Divisors (4): 1, 2, 8221, 16442.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 16442: a semiprime: 2 × 8221, the product of two primes.
- 2
16442 is composite. Its prime factorisation is
- 3
The divisors add up to 24666; without 16442 itself that is 8224, so 16442 is deficient (8224 is less than 16442). Euler's totient φ(16442) = 8220 numbers up to 16442 share no factor with it.
- 4
The digits of 16442 add up to 17, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 40 steps to reach 1.
LaTeX source of the formulas on this page
\[ 16442 = 2 \times 8221 \]
16442 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 24666 |
| Euler totient φ(n) | 8220 |
| Square | 270339364 |
| Cube | 4444919822888 |
| Square root | 128.226362 |
| Digit sum / digital root | 17 / 8 |
| Collatz steps to 1 | 40 |
| Scientific notation | 1.6442 × |
16442 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand four hundred and forty-two |
| Binary (base 2) | 100000000111010 |
| Octal (base 8) | 40072 |
| Hexadecimal (base 16) | 403A |
| Base 3 | 211112222 |
| As time | 16442 seconds = 4 h 34 min 2 s |
Is 16442 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (16442 ÷ 2 = 8221) | 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 | No (remainder 2) | 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 6) | 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 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | 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 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 16442 a prime number?
No. 16442 = 2 × 8221, so it is divisible by 2.
What are the factors of 16442?
1, 2, 8221, 16442.
What is 16442 in binary?
100000000111010 (hexadecimal 403A, octal 40072).
What is the square root of 16442?
About 128.2264.
Is 16442 divisible by 3?
No. Its digits add up to 17, which is not a multiple of 3.
What is special about the number 16442?
16442 is a semiprime: 2 × 8221, the product of two primes.