The number 1425
1425 is a composite number with 12 divisors. Its prime factorisation is 3 × × 19. Divisors (12): 1, 3, 5, 15, 19, 25, 57, 75, 95, 285, 475, 1425.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
1425 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
1425 is composite. Its prime factorisation is
- 3
The divisors add up to 2480; without 1425 itself that is 1055, so 1425 is deficient (1055 is less than 1425). Euler's totient φ(1425) = 720 numbers up to 1425 share no factor with it.
- 4
The digits of 1425 add up to 12, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 26 steps to reach 1.
LaTeX source of the formulas on this page
\[ 1425 = 3 \times 5^{2} \times 19 \]1425 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 2480 |
| Euler totient φ(n) | 720 |
| Square | 2030625 |
| Cube | 2893640625 |
| Square root | 37.749172 (= 5√57) |
| Digit sum / digital root | 12 / 3 |
| Collatz steps to 1 | 26 |
| Scientific notation | 1.425 × |
1425 in other forms
| Form | Value |
|---|---|
| In words | one thousand four hundred and twenty-five |
| Roman numerals | MCDXXV |
| Binary (base 2) | 10110010001 |
| Octal (base 8) | 2621 |
| Hexadecimal (base 16) | 591 |
| Base 3 | 1221210 |
| As time | 1425 seconds = 23 min 45 s |
Is 1425 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 (1425 ÷ 3 = 475) | 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 (1425 ÷ 5 = 285) | 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 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 3) | 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 6) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 1425 a prime number?
No. 1425 = 3 × × 19, so it is divisible by 3.
What are the factors of 1425?
1, 3, 5, 15, 19, 25, 57, 75, 95, 285, 475, 1425.
What is 1425 in binary?
10110010001 (hexadecimal 591, octal 2621).
What is the square root of 1425?
About 37.7492, exactly 5√57.
What is 1425 in Roman numerals?
MCDXXV.
Is 1425 divisible by 3?
Yes. Its digits add up to 12, a multiple of 3.
What is special about the number 1425?
It is a composite number with 12 divisors.