The number 3445
3445 is a composite number with 8 divisors. Its prime factorisation is 5 × 13 × 53. Divisors (8): 1, 5, 13, 53, 65, 265, 689, 3445.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
3445 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
3445 is composite. Its prime factorisation is
- 3
The divisors add up to 4536; without 3445 itself that is 1091, so 3445 is deficient (1091 is less than 3445). Euler's totient φ(3445) = 2496 numbers up to 3445 share no factor with it.
- 4
The digits of 3445 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 105 steps to reach 1.
LaTeX source of the formulas on this page
\[ 3445 = 5 \times 13 \times 53 \]
3445 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 4536 |
| Euler totient φ(n) | 2496 |
| Square | 11868025 |
| Cube | 40885346125 |
| Square root | 58.694122 |
| Digit sum / digital root | 16 / 7 |
| Collatz steps to 1 | 105 |
| Scientific notation | 3.445 × |
3445 in other forms
| Form | Value |
|---|---|
| In words | three thousand four hundred and forty-five |
| Roman numerals | MMMCDXLV |
| Binary (base 2) | 110101110101 |
| Octal (base 8) | 6565 |
| Hexadecimal (base 16) | D75 |
| Base 3 | 11201121 |
| As time | 3445 seconds = 57 min 25 s |
Is 3445 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 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (3445 ÷ 5 = 689) | 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 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 5) | 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 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 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 3445 a prime number?
No. 3445 = 5 × 13 × 53, so it is divisible by 5.
What are the factors of 3445?
1, 5, 13, 53, 65, 265, 689, 3445.
What is 3445 in binary?
110101110101 (hexadecimal D75, octal 6565).
What is the square root of 3445?
About 58.6941.
What is 3445 in Roman numerals?
MMMCDXLV.
Is 3445 divisible by 3?
No. Its digits add up to 16, which is not a multiple of 3.
What is special about the number 3445?
It is a composite number with 8 divisors.