The number 49978
49978 is a composite number with 4 divisors. Its prime factorisation is 2 × 24989. Divisors (4): 1, 2, 24989, 49978.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 49978: a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 24989, the product of two primes.
- 2
49978 is composite. Its prime factorisation is
- 3
The divisors add up to 74970; without 49978 itself that is 24992, so 49978 is deficient (24992 is less than 49978). Euler's totient φ(49978) = 24988 numbers up to 49978 share no factor with it.
- 4
The digits of 49978 add up to 37, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 189 steps to reach 1.
LaTeX source of the formulas on this page
\[ 49978 = 2 \times 24989 \]
49978 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 74970 |
| Euler totient φ(n) | 24988 |
| Square | 2497800484 |
| Cube | 124835072589352 |
| Square root | 223.557599 |
| Digit sum / digital root | 37 / 1 |
| Collatz steps to 1 | 189 |
| Scientific notation | 4.9978 × |
49978 in other forms
| Form | Value |
|---|---|
| In words | forty-nine thousand nine hundred and seventy-eight |
| Binary (base 2) | 1100001100111010 |
| Octal (base 8) | 141472 |
| Hexadecimal (base 16) | C33A |
| Base 3 | 2112120001 |
| As time | 49978 seconds = 13 h 52 min 58 s |
Is 49978 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (49978 ÷ 2 = 24989) | 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 2) | 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 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | 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 2) | 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 8) | 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 10) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 49978 a prime number?
No. 49978 = 2 × 24989, so it is divisible by 2.
What are the factors of 49978?
1, 2, 24989, 49978.
What is 49978 in binary?
1100001100111010 (hexadecimal C33A, octal 141472).
What is the square root of 49978?
About 223.5576.
Is 49978 divisible by 3?
No. Its digits add up to 37, which is not a multiple of 3.
What is special about the number 49978?
49978 is a happy number: repeatedly adding the squares of its digits reaches 1; a semiprime: 2 × 24989, the product of two primes.