The number 235
235 is a composite number with 4 divisors. Its prime factorisation is 5 × 47. Divisors (4): 1, 5, 47, 235.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 235: a semiprime: 5 × 47, the product of two primes.
- 2
235 is composite. Its prime factorisation is
- 3
The divisors add up to 288; without 235 itself that is 53, so 235 is deficient (53 is less than 235). Euler's totient φ(235) = 184 numbers up to 235 share no factor with it.
- 4
The digits of 235 add up to 10, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 127 steps to reach 1.
LaTeX source of the formulas on this page
\[ 235 = 5 \times 47 \]
235 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 288 |
| Euler totient φ(n) | 184 |
| Square | 55225 |
| Cube | 12977875 |
| Square root | 15.329710 |
| Digit sum / digital root | 10 / 1 |
| Collatz steps to 1 | 127 |
| Scientific notation | 2.35 × |
235 in other forms
| Form | Value |
|---|---|
| In words | two hundred and thirty-five |
| Roman numerals | CCXXXV |
| Binary (base 2) | 11101011 |
| Octal (base 8) | 353 |
| Hexadecimal (base 16) | EB |
| Base 3 | 22201 |
| As time | 235 seconds = 3 min 55 s |
Is 235 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (235 ÷ 5 = 47) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | 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 3) | 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 5) | 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 7) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 235 a prime number?
No. 235 = 5 × 47, so it is divisible by 5.
What are the factors of 235?
1, 5, 47, 235.
What is 235 in binary?
11101011 (hexadecimal EB, octal 353).
What is the square root of 235?
About 15.3297.
What is 235 in Roman numerals?
CCXXXV.
Is 235 divisible by 3?
No. Its digits add up to 10, which is not a multiple of 3.
What is special about the number 235?
235 is a semiprime: 5 × 47, the product of two primes.