The number 2485
2485 is a triangular number: 1 + 2 + … + 70 = 2485. Its prime factorisation is 5 × 7 × 71. Divisors (8): 1, 5, 7, 35, 71, 355, 497, 2485.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 2485: a triangular number: 1 + 2 + … + 70 = 2485; a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
2485 is composite. Its prime factorisation is
- 3
The divisors add up to 3456; without 2485 itself that is 971, so 2485 is deficient (971 is less than 2485). Euler's totient φ(2485) = 1680 numbers up to 2485 share no factor with it.
- 4
The digits of 2485 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 89 steps to reach 1.
LaTeX source of the formulas on this page
\[ 2485 = 5 \times 7 \times 71 \]
2485 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 3456 |
| Euler totient φ(n) | 1680 |
| Square | 6175225 |
| Cube | 15345434125 |
| Square root | 49.849774 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 89 |
| Scientific notation | 2.485 × |
2485 in other forms
| Form | Value |
|---|---|
| In words | two thousand four hundred and eighty-five |
| Roman numerals | MMCDLXXXV |
| Binary (base 2) | 100110110101 |
| Octal (base 8) | 4665 |
| Hexadecimal (base 16) | 9B5 |
| Base 3 | 10102001 |
| As time | 2485 seconds = 41 min 25 s |
Is 2485 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 (2485 ÷ 5 = 497) | 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 | Yes (2485 ÷ 7 = 355) | 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 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 10) | 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 2485 a prime number?
No. 2485 = 5 × 7 × 71, so it is divisible by 5.
What are the factors of 2485?
1, 5, 7, 35, 71, 355, 497, 2485.
What is 2485 in binary?
100110110101 (hexadecimal 9B5, octal 4665).
What is the square root of 2485?
About 49.8498.
What is 2485 in Roman numerals?
MMCDLXXXV.
Is 2485 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 2485?
2485 is a triangular number: 1 + 2 + … + 70 = 2485; a happy number: repeatedly adding the squares of its digits reaches 1.