The number 43138
43138 is a composite number with 4 divisors. Its prime factorisation is 2 × 21569. Divisors (4): 1, 2, 21569, 43138.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 43138: a semiprime: 2 × 21569, the product of two primes.
- 2
43138 is composite. Its prime factorisation is
- 3
The divisors add up to 64710; without 43138 itself that is 21572, so 43138 is deficient (21572 is less than 43138). Euler's totient φ(43138) = 21568 numbers up to 43138 share no factor with it.
- 4
The digits of 43138 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 31 steps to reach 1.
LaTeX source of the formulas on this page
\[ 43138 = 2 \times 21569 \]
43138 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 64710 |
| Euler totient φ(n) | 21568 |
| Square | 1860887044 |
| Cube | 80274945304072 |
| Square root | 207.696895 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 31 |
| Scientific notation | 4.3138 × |
43138 in other forms
| Form | Value |
|---|---|
| In words | forty-three thousand one hundred and thirty-eight |
| Binary (base 2) | 1010100010000010 |
| Octal (base 8) | 124202 |
| Hexadecimal (base 16) | A882 |
| Base 3 | 2012011201 |
| As time | 43138 seconds = 11 h 58 min 58 s |
Is 43138 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (43138 ÷ 2 = 21569) | 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 4) | 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 1) | 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 7) | 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 43138 a prime number?
No. 43138 = 2 × 21569, so it is divisible by 2.
What are the factors of 43138?
1, 2, 21569, 43138.
What is 43138 in binary?
1010100010000010 (hexadecimal A882, octal 124202).
What is the square root of 43138?
About 207.6969.
Is 43138 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 43138?
43138 is a semiprime: 2 × 21569, the product of two primes.