The number 16438
16438 is a composite number with 4 divisors. Its prime factorisation is 2 × 8219. Divisors (4): 1, 2, 8219, 16438.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 16438: a semiprime: 2 × 8219, the product of two primes.
- 2
16438 is composite. Its prime factorisation is
- 3
The divisors add up to 24660; without 16438 itself that is 8222, so 16438 is deficient (8222 is less than 16438). Euler's totient φ(16438) = 8218 numbers up to 16438 share no factor with it.
- 4
The digits of 16438 add up to 22, 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
\[ 16438 = 2 \times 8219 \]
16438 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 24660 |
| Euler totient φ(n) | 8218 |
| Square | 270207844 |
| Cube | 4441676539672 |
| Square root | 128.210764 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 190 |
| Scientific notation | 1.6438 × |
16438 in other forms
| Form | Value |
|---|---|
| In words | sixteen thousand four hundred and thirty-eight |
| Binary (base 2) | 100000000110110 |
| Octal (base 8) | 40066 |
| Hexadecimal (base 16) | 4036 |
| Base 3 | 211112211 |
| As time | 16438 seconds = 4 h 33 min 58 s |
Is 16438 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (16438 ÷ 2 = 8219) | 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 2) | 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 4) | 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 6) | 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 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 16438 a prime number?
No. 16438 = 2 × 8219, so it is divisible by 2.
What are the factors of 16438?
1, 2, 8219, 16438.
What is 16438 in binary?
100000000110110 (hexadecimal 4036, octal 40066).
What is the square root of 16438?
About 128.2108.
Is 16438 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 16438?
16438 is a semiprime: 2 × 8219, the product of two primes.