The number 1189
1189 is a composite number with 4 divisors. Its prime factorisation is 29 × 41. Divisors (4): 1, 29, 41, 1189.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 1189: a semiprime: 29 × 41, the product of two primes.
- 2
1189 is composite. Its prime factorisation is
- 3
The divisors add up to 1260; without 1189 itself that is 71, so 1189 is deficient (71 is less than 1189). Euler's totient φ(1189) = 1120 numbers up to 1189 share no factor with it.
- 4
The digits of 1189 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 75 steps to reach 1.
LaTeX source of the formulas on this page
\[ 1189 = 29 \times 41 \]
1189 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 1260 |
| Euler totient φ(n) | 1120 |
| Square | 1413721 |
| Cube | 1680914269 |
| Square root | 34.481879 |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 75 |
| Scientific notation | 1.189 × |
1189 in other forms
| Form | Value |
|---|---|
| In words | one thousand one hundred and eighty-nine |
| Roman numerals | MCLXXXIX |
| Binary (base 2) | 10010100101 |
| Octal (base 8) | 2245 |
| Hexadecimal (base 16) | 4A5 |
| Base 3 | 1122001 |
| As time | 1189 seconds = 19 min 49 s |
Is 1189 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 | No (remainder 4) | 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 | No (remainder 6) | 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 9) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | 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 1189 a prime number?
No. 1189 = 29 × 41, so it is divisible by 29.
What are the factors of 1189?
1, 29, 41, 1189.
What is 1189 in binary?
10010100101 (hexadecimal 4A5, octal 2245).
What is the square root of 1189?
About 34.4819.
What is 1189 in Roman numerals?
MCLXXXIX.
Is 1189 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 1189?
1189 is a semiprime: 29 × 41, the product of two primes.