8391

8391 is a natural number that sits between 8390 and 8392. It is an odd composite number.

In its prime factorization, 8391 = 3 × 2797, where 2797 is a prime number. Therefore, 8391 is a semiprime. Its positive divisors are 1, 3, 2797, and 8391.

In base representations, 8391 is written as binary 10000011000111 and in hexadecimal as 0x20C7. The sum of its digits in base 10 is 21, making it divisible by 3 but not by 9. It is not a prime, nor a perfect power.

Euler's totient function yields φ(8391) = 5592, since for a semiprime n = p q with p = 3 and q = 2797 the value is (p − 1)(q − 1). The Carmichael function gives λ(8391) = lcm(2, 2796) = 2796.

Beyond number theory, 8391 does not have a widely recognized meaning or designation in common culture; it primarily appears as a numerical identifier in mathematical contexts or cataloging systems.