The number 3555
3555 is a composite number with 12 divisors. Its prime factorisation is × 5 × 79. Divisors (12): 1, 3, 5, 9, 15, 45, 79, 237, 395, 711, 1185, 3555.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
3555 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
3555 is composite. Its prime factorisation is
- 3
The divisors add up to 6240; without 3555 itself that is 2685, so 3555 is deficient (2685 is less than 3555). Euler's totient φ(3555) = 1872 numbers up to 3555 share no factor with it.
- 4
The digits of 3555 add up to 18, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 118 steps to reach 1.
LaTeX source of the formulas on this page
\[ 3555 = 3^{2} \times 5 \times 79 \]3555 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 6240 |
| Euler totient φ(n) | 1872 |
| Square | 12638025 |
| Cube | 44928178875 |
| Square root | 59.623821 (= 3√395) |
| Digit sum / digital root | 18 / 9 |
| Collatz steps to 1 | 118 |
| Scientific notation | 3.555 × |
3555 in other forms
| Form | Value |
|---|---|
| In words | three thousand five hundred and fifty-five |
| Roman numerals | MMMDLV |
| Binary (base 2) | 110111100011 |
| Octal (base 8) | 6743 |
| Hexadecimal (base 16) | DE3 |
| Base 3 | 11212200 |
| As time | 3555 seconds = 59 min 15 s |
Is 3555 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 | Yes (3555 ÷ 3 = 1185) | 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 (3555 ÷ 5 = 711) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | 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 3) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (3555 ÷ 9 = 395) | 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 2) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 3) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 3555 a prime number?
No. 3555 = × 5 × 79, so it is divisible by 3.
What are the factors of 3555?
1, 3, 5, 9, 15, 45, 79, 237, 395, 711, 1185, 3555.
What is 3555 in binary?
110111100011 (hexadecimal DE3, octal 6743).
What is the square root of 3555?
About 59.6238, exactly 3√395.
What is 3555 in Roman numerals?
MMMDLV.
Is 3555 divisible by 3?
Yes. Its digits add up to 18, a multiple of 3.
What is special about the number 3555?
It is a composite number with 12 divisors.