The number 40121
40121 is a composite number with 4 divisors. Its prime factorisation is 53 × 757. Divisors (4): 1, 53, 757, 40121.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 40121: a semiprime: 53 × 757, the product of two primes.
- 2
40121 is composite. Its prime factorisation is
- 3
The divisors add up to 40932; without 40121 itself that is 811, so 40121 is deficient (811 is less than 40121). Euler's totient φ(40121) = 39312 numbers up to 40121 share no factor with it.
- 4
The digits of 40121 add up to 8, and repeating that until one digit is left gives the digital root 8. The Collatz sequence (halve if even, else 3n+1) takes 49 steps to reach 1.
LaTeX source of the formulas on this page
\[ 40121 = 53 \times 757 \]
40121 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 40932 |
| Euler totient φ(n) | 39312 |
| Square | 1609694641 |
| Cube | 64582558691561 |
| Square root | 200.302272 |
| Digit sum / digital root | 8 / 8 |
| Collatz steps to 1 | 49 |
| Scientific notation | 4.0121 × |
40121 in other forms
| Form | Value |
|---|---|
| In words | forty thousand one hundred and twenty-one |
| Binary (base 2) | 1001110010111001 |
| Octal (base 8) | 116271 |
| Hexadecimal (base 16) | 9CB9 |
| Base 3 | 2001000222 |
| As time | 40121 seconds = 11 h 8 min 41 s |
Is 40121 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 1) | 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 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | 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 40121 a prime number?
No. 40121 = 53 × 757, so it is divisible by 53.
What are the factors of 40121?
1, 53, 757, 40121.
What is 40121 in binary?
1001110010111001 (hexadecimal 9CB9, octal 116271).
What is the square root of 40121?
About 200.3023.
Is 40121 divisible by 3?
No. Its digits add up to 8, which is not a multiple of 3.
What is special about the number 40121?
40121 is a semiprime: 53 × 757, the product of two primes.