The number 358
358 is a composite number with 4 divisors. Its prime factorisation is 2 × 179. Divisors (4): 1, 2, 179, 358.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 358: a semiprime: 2 × 179, the product of two primes.
- 2
358 is composite. Its prime factorisation is
- 3
The divisors add up to 540; without 358 itself that is 182, so 358 is deficient (182 is less than 358). Euler's totient φ(358) = 178 numbers up to 358 share no factor with it.
- 4
The digits of 358 add up to 16, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 32 steps to reach 1.
LaTeX source of the formulas on this page
\[ 358 = 2 \times 179 \]
358 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 540 |
| Euler totient φ(n) | 178 |
| Square | 128164 |
| Cube | 45882712 |
| Square root | 18.920888 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 32 |
| Scientific notation | 3.58 × |
358 in other forms
| Form | Value |
|---|---|
| In words | three hundred and fifty-eight |
| Roman numerals | CCCLVIII |
| Binary (base 2) | 101100110 |
| Octal (base 8) | 546 |
| Hexadecimal (base 16) | 166 |
| Base 3 | 111021 |
| As time | 358 seconds = 5 min 58 s |
Is 358 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (358 ÷ 2 = 179) | 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 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | 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 6) | 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 358 a prime number?
No. 358 = 2 × 179, so it is divisible by 2.
What are the factors of 358?
1, 2, 179, 358.
What is 358 in binary?
101100110 (hexadecimal 166, octal 546).
What is the square root of 358?
About 18.9209.
What is 358 in Roman numerals?
CCCLVIII.
Is 358 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 358?
358 is a semiprime: 2 × 179, the product of two primes.