The number 42998
42998 is a composite number with 4 divisors. Its prime factorisation is 2 × 21499. Divisors (4): 1, 2, 21499, 42998.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 42998: a semiprime: 2 × 21499, the product of two primes.
- 2
42998 is composite. Its prime factorisation is
- 3
The divisors add up to 64500; without 42998 itself that is 21502, so 42998 is deficient (21502 is less than 42998). Euler's totient φ(42998) = 21498 numbers up to 42998 share no factor with it.
- 4
The digits of 42998 add up to 32, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 101 steps to reach 1.
LaTeX source of the formulas on this page
\[ 42998 = 2 \times 21499 \]
42998 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 64500 |
| Euler totient φ(n) | 21498 |
| Square | 1848828004 |
| Cube | 79495906515992 |
| Square root | 207.359591 |
| Digit sum / digital root | 32 / 5 |
| Collatz steps to 1 | 101 |
| Scientific notation | 4.2998 × |
42998 in other forms
| Form | Value |
|---|---|
| In words | forty-two thousand nine hundred and ninety-eight |
| Binary (base 2) | 1010011111110110 |
| Octal (base 8) | 123766 |
| Hexadecimal (base 16) | A7F6 |
| Base 3 | 2011222112 |
| As time | 42998 seconds = 11 h 56 min 38 s |
Is 42998 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (42998 ÷ 2 = 21499) | 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 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 2) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | 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 10) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 42998 a prime number?
No. 42998 = 2 × 21499, so it is divisible by 2.
What are the factors of 42998?
1, 2, 21499, 42998.
What is 42998 in binary?
1010011111110110 (hexadecimal A7F6, octal 123766).
What is the square root of 42998?
About 207.3596.
Is 42998 divisible by 3?
No. Its digits add up to 32, which is not a multiple of 3.
What is special about the number 42998?
42998 is a semiprime: 2 × 21499, the product of two primes.