6805921 has 4 divisors (see below), whose sum is σ = 6822144. Its totient is φ = 6789700.

The previous prime is 6805913. The next prime is 6805937. The reversal of 6805921 is 1295086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6805921 - 2³ = 6805913 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6805991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7465 + ... + 8326.

It is an arithmetic number, because the mean of its divisors is an integer number (1705536).

Almost surely, 2^6805921 is an apocalyptic number.

It is an amenable number.

6805921 is a deficient number, since it is larger than the sum of its proper divisors (16223).

6805921 is a wasteful number, since it uses less digits than its factorization.

6805921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16222.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 6805921 is about 2608.8160149769. The cubic root of 6805921 is about 189.5086194774.

The spelling of 6805921 in words is "six million, eight hundred five thousand, nine hundred twenty-one".