The number 40028
40028 is a composite number with 6 divisors. Its prime factorisation is × 10007. Divisors (6): 1, 2, 4, 10007, 20014, 40028.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
40028 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
40028 is composite. Its prime factorisation is
- 3
The divisors add up to 70056; without 40028 itself that is 30028, so 40028 is deficient (30028 is less than 40028). Euler's totient φ(40028) = 20012 numbers up to 40028 share no factor with it.
- 4
The digits of 40028 add up to 14, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 181 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40028 = 2^{2} \times 10007 \]40028 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 6 |
| Sum of divisors | 70056 |
| Euler totient φ(n) | 20012 |
| Square | 1602240784 |
| Cube | 64134494101952 |
| Square root | 200.069988 (= 2√10007) |
| Digit sum / digital root | 14 / 5 |
| Collatz steps to 1 | 181 |
| Scientific notation | 4.0028 × |
40028 in other forms
| Form | Value |
|---|---|
| In words | forty thousand and twenty-eight |
| Binary (base 2) | 1001110001011100 |
| Octal (base 8) | 116134 |
| Hexadecimal (base 16) | 9C5C |
| Base 3 | 2000220112 |
| As time | 40028 seconds = 11 h 7 min 8 s |
Is 40028 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (40028 ÷ 2 = 20014) | 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 | Yes (40028 ÷ 4 = 10007) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 2) | 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 4) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | 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 8) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 40028 a prime number?
No. 40028 = × 10007, so it is divisible by 2.
What are the factors of 40028?
1, 2, 4, 10007, 20014, 40028.
What is 40028 in binary?
1001110001011100 (hexadecimal 9C5C, octal 116134).
What is the square root of 40028?
About 200.0700, exactly 2√10007.
Is 40028 divisible by 3?
No. Its digits add up to 14, which is not a multiple of 3.
What is special about the number 40028?
It is a composite number with 6 divisors.