The number 42890
42890 is a composite number with 8 divisors. Its prime factorisation is 2 × 5 × 4289. Divisors (8): 1, 2, 5, 10, 4289, 8578, 21445, 42890.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
42890 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
42890 is composite. Its prime factorisation is
- 3
The divisors add up to 77220; without 42890 itself that is 34330, so 42890 is deficient (34330 is less than 42890). Euler's totient φ(42890) = 17152 numbers up to 42890 share no factor with it.
- 4
The digits of 42890 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42890 = 2 \times 5 \times 4289 \]
42890 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 77220 |
| Euler totient φ(n) | 17152 |
| Square | 1839552100 |
| Cube | 78898389569000 |
| Square root | 207.099010 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 75 |
| Scientific notation | 4.289 × |
42890 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand eight hundred and ninety |
| Binary (base 2) | 1010011110001010 |
| Octal (base 8) | 123612 |
| Hexadecimal (base 16) | A78A |
| Base 3 | 2011211112 |
| As time | 42890 seconds = 11 h 54 min 50 s |
Is 42890 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42890 ÷ 2 = 21445) | 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 | Yes (42890 ÷ 5 = 8578) | 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 1) | 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 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | Yes (42890 ÷ 10 = 4289) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | 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 42890 a prime number?
No. 42890 = 2 × 5 × 4289, so it is divisible by 2.
What are the factors of 42890?
1, 2, 5, 10, 4289, 8578, 21445, 42890.
What is 42890 in binary?
1010011110001010 (hexadecimal A78A, octal 123612).
What is the square root of 42890?
About 207.0990.
Is 42890 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 42890?
It is a composite number with 8 divisors.