The number 15977
15977 is a composite number with 4 divisors. Its prime factorisation is 13 × 1229. Divisors (4): 1, 13, 1229, 15977.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 15977: a semiprime: 13 × 1229, the product of two primes.
- 2
15977 is composite. Its prime factorisation is
- 3
The divisors add up to 17220; without 15977 itself that is 1243, so 15977 is deficient (1243 is less than 15977). Euler's totient φ(15977) = 14736 numbers up to 15977 share no factor with it.
- 4
The digits of 15977 add up to 29, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 97 steps to reach 1.
LaTeX source of the formulas on this page
\[ 15977 = 13 \times 1229 \]
15977 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 17220 |
| Euler totient φ(n) | 14736 |
| Square | 255264529 |
| Cube | 4078361379833 |
| Square root | 126.400158 |
| Digit sum / digital root | 29 / 2 |
| Collatz steps to 1 | 97 |
| Scientific notation | 1.5977 × |
15977 in other forms
| Form | Value |
|---|---|
| In words | fifteen thousand nine hundred and seventy-seven |
| Binary (base 2) | 11111001101001 |
| Octal (base 8) | 37151 |
| Hexadecimal (base 16) | 3E69 |
| Base 3 | 210220202 |
| As time | 15977 seconds = 4 h 26 min 17 s |
Is 15977 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 2) | 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 3) | 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 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | 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 15977 a prime number?
No. 15977 = 13 × 1229, so it is divisible by 13.
What are the factors of 15977?
1, 13, 1229, 15977.
What is 15977 in binary?
11111001101001 (hexadecimal 3E69, octal 37151).
What is the square root of 15977?
About 126.4002.
Is 15977 divisible by 3?
No. Its digits add up to 29, which is not a multiple of 3.
What is special about the number 15977?
15977 is a semiprime: 13 × 1229, the product of two primes.