The number 1379
1379 is a composite number with 4 divisors. Its prime factorisation is 7 × 197. Divisors (4): 1, 7, 197, 1379.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 1379: a semiprime: 7 × 197, the product of two primes.
- 2
1379 is composite. Its prime factorisation is
- 3
The divisors add up to 1584; without 1379 itself that is 205, so 1379 is deficient (205 is less than 1379). Euler's totient φ(1379) = 1176 numbers up to 1379 share no factor with it.
- 4
The digits of 1379 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 127 steps to reach 1.
LaTeX source of the formulas on this page
\[ 1379 = 7 \times 197 \]
1379 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 1584 |
| Euler totient φ(n) | 1176 |
| Square | 1901641 |
| Cube | 2622362939 |
| Square root | 37.134889 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 127 |
| Scientific notation | 1.379 × |
1379 in other forms
| Form | Value |
|---|---|
| In words | one thousand three hundred and seventy-nine |
| Roman numerals | MCCCLXXIX |
| Binary (base 2) | 10101100011 |
| Octal (base 8) | 2543 |
| Hexadecimal (base 16) | 563 |
| Base 3 | 1220002 |
| As time | 1379 seconds = 22 min 59 s |
Is 1379 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 3) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 4) | 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 | Yes (1379 ÷ 7 = 197) | 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 3) | 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 9) | 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 11) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 1379 a prime number?
No. 1379 = 7 × 197, so it is divisible by 7.
What are the factors of 1379?
1, 7, 197, 1379.
What is 1379 in binary?
10101100011 (hexadecimal 563, octal 2543).
What is the square root of 1379?
About 37.1349.
What is 1379 in Roman numerals?
MCCCLXXIX.
Is 1379 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 1379?
1379 is a semiprime: 7 × 197, the product of two primes.