The number 42860
42860 is a composite number with 12 divisors. Its prime factorisation is × 5 × 2143. Divisors (12): 1, 2, 4, 5, 10, 20, 2143, 4286, 8572, 10715, 21430, 42860.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42860: a Harshad number: divisible by its digit sum 20.
- 2
42860 is composite. Its prime factorisation is
- 3
The divisors add up to 90048; without 42860 itself that is 47188, so 42860 is abundant (47188 is more than 42860). Euler's totient φ(42860) = 17136 numbers up to 42860 share no factor with it.
- 4
The digits of 42860 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 194 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42860 = 2^{2} \times 5 \times 2143 \]42860 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 90048 |
| Euler totient φ(n) | 17136 |
| Square | 1836979600 |
| Cube | 78732945656000 |
| Square root | 207.026568 (= 2√10715) |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 194 |
| Scientific notation | 4.286 × |
42860 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand eight hundred and sixty |
| Binary (base 2) | 1010011101101100 |
| Octal (base 8) | 123554 |
| Hexadecimal (base 16) | A76C |
| Base 3 | 2011210102 |
| As time | 42860 seconds = 11 h 54 min 20 s |
Is 42860 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42860 ÷ 2 = 21430) | 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 | Yes (42860 ÷ 4 = 10715) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (42860 ÷ 5 = 8572) | 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 4) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (42860 ÷ 10 = 4286) | 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 8) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42860 a prime number?
No. 42860 = × 5 × 2143, so it is divisible by 2.
What are the factors of 42860?
1, 2, 4, 5, 10, 20, 2143, 4286, 8572, 10715, 21430, 42860.
What is 42860 in binary?
1010011101101100 (hexadecimal A76C, octal 123554).
What is the square root of 42860?
About 207.0266, exactly 2√10715.
Is 42860 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 42860?
42860 is a Harshad number: divisible by its digit sum 20.