The number 18449
18449 is a composite number with 4 divisors. Its prime factorisation is 19 × 971. Divisors (4): 1, 19, 971, 18449.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 18449: a semiprime: 19 × 971, the product of two primes.
- 2
18449 is composite. Its prime factorisation is
- 3
The divisors add up to 19440; without 18449 itself that is 991, so 18449 is deficient (991 is less than 18449). Euler's totient φ(18449) = 17460 numbers up to 18449 share no factor with it.
- 4
The digits of 18449 add up to 26, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 110 steps to reach 1.
LaTeX source of the formulas on this page
\[ 18449 = 19 \times 971 \]
18449 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 19440 |
| Euler totient φ(n) | 17460 |
| Square | 340365601 |
| Cube | 6279404972849 |
| Square root | 135.827096 |
| Digit sum / digital root | 26 / 8 |
| Collatz steps to 1 | 110 |
| Scientific notation | 1.8449 × |
18449 in other forms
| Form | Value |
|---|---|
| In words | eighteen thousand four hundred and forty-nine |
| Binary (base 2) | 100100000010001 |
| Octal (base 8) | 44021 |
| Hexadecimal (base 16) | 4811 |
| Base 3 | 221022022 |
| As time | 18449 seconds = 5 h 7 min 29 s |
Is 18449 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 2) | 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 | No (remainder 4) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 5) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 8) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 9) | 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 5) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 18449 a prime number?
No. 18449 = 19 × 971, so it is divisible by 19.
What are the factors of 18449?
1, 19, 971, 18449.
What is 18449 in binary?
100100000010001 (hexadecimal 4811, octal 44021).
What is the square root of 18449?
About 135.8271.
Is 18449 divisible by 3?
No. Its digits add up to 26, which is not a multiple of 3.
What is special about the number 18449?
18449 is a semiprime: 19 × 971, the product of two primes.