The number 42958
42958 is a composite number with 8 divisors. Its prime factorisation is 2 × 47 × 457. Divisors (8): 1, 2, 47, 94, 457, 914, 21479, 42958.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42958: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
42958 is composite. Its prime factorisation is
- 3
The divisors add up to 65952; without 42958 itself that is 22994, so 42958 is deficient (22994 is less than 42958). Euler's totient φ(42958) = 20976 numbers up to 42958 share no factor with it.
- 4
The digits of 42958 add up to 28, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 194 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42958 = 2 \times 47 \times 457 \]
42958 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 65952 |
| Euler totient φ(n) | 20976 |
| Square | 1845389764 |
| Cube | 79274253481912 |
| Square root | 207.263118 |
| Digit sum / digital root | 28 / 1 |
| Collatz steps to 1 | 194 |
| Scientific notation | 4.2958 × |
42958 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand nine hundred and fifty-eight |
| Binary (base 2) | 1010011111001110 |
| Octal (base 8) | 123716 |
| Hexadecimal (base 16) | A7CE |
| Base 3 | 2011221001 |
| As time | 42958 seconds = 11 h 55 min 58 s |
Is 42958 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42958 ÷ 2 = 21479) | 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 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 6) | 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 3) | 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 42958 a prime number?
No. 42958 = 2 × 47 × 457, so it is divisible by 2.
What are the factors of 42958?
1, 2, 47, 94, 457, 914, 21479, 42958.
What is 42958 in binary?
1010011111001110 (hexadecimal A7CE, octal 123716).
What is the square root of 42958?
About 207.2631.
Is 42958 divisible by 3?
No. Its digits add up to 28, which is not a multiple of 3.
What is special about the number 42958?
42958 is a happy number: repeatedly adding the squares of its digits reaches 1.