6808391 has 4 divisors (see below), whose sum is σ = 7104432. Its totient is φ = 6512352.

The previous prime is 6808273. The next prime is 6808397. The reversal of 6808391 is 1938086.

6808391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6808391 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6808397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147986 + ... + 148031.

It is an arithmetic number, because the mean of its divisors is an integer number (1776108).

Almost surely, 2^6808391 is an apocalyptic number.

6808391 is a deficient number, since it is larger than the sum of its proper divisors (296041).

6808391 is a wasteful number, since it uses less digits than its factorization.

6808391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296040.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 6808391 is about 2609.2893668583. The cubic root of 6808391 is about 189.5315421490.

The spelling of 6808391 in words is "six million, eight hundred eight thousand, three hundred ninety-one".