The number 5421
5421 is a composite number with 8 divisors. Its prime factorisation is 3 × 13 × 139. Divisors (8): 1, 3, 13, 39, 139, 417, 1807, 5421.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
5421 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
5421 is composite. Its prime factorisation is
- 3
The divisors add up to 7840; without 5421 itself that is 2419, so 5421 is deficient (2419 is less than 5421). Euler's totient φ(5421) = 3312 numbers up to 5421 share no factor with it.
- 4
The digits of 5421 add up to 12, and repeating that until one digit is left gives the digital root 3. The Collatz sequence (halve if even, else 3n+1) takes 116 steps to reach 1.
LaTeX source of the formulas on this page
\[ 5421 = 3 \times 13 \times 139 \]
5421 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 8 |
| Sum of divisors | 7840 |
| Euler totient φ(n) | 3312 |
| Square | 29387241 |
| Cube | 159308233461 |
| Square root | 73.627441 |
| Digit sum / digital root | 12 / 3 |
| Collatz steps to 1 | 116 |
| Scientific notation | 5.421 × |
5421 in other forms
| Form | Value |
|---|---|
| In words | five thousand four hundred and twenty-one |
| Binary (base 2) | 1010100101101 |
| Octal (base 8) | 12455 |
| Hexadecimal (base 16) | 152D |
| Base 3 | 21102210 |
| As time | 5421 seconds = 1 h 30 min 21 s |
Is 5421 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 | Yes (5421 ÷ 3 = 1807) | 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 1) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 3) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 1) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 9) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 5421 a prime number?
No. 5421 = 3 × 13 × 139, so it is divisible by 3.
What are the factors of 5421?
1, 3, 13, 39, 139, 417, 1807, 5421.
What is 5421 in binary?
1010100101101 (hexadecimal 152D, octal 12455).
What is the square root of 5421?
About 73.6274.
Is 5421 divisible by 3?
Yes. Its digits add up to 12, a multiple of 3.
What is special about the number 5421?
It is a composite number with 8 divisors.