6808821 has 12 divisors (see below), whose sum is σ = 9582912. Its totient is φ = 4299624.

The previous prime is 6808817. The next prime is 6808861. The reversal of 6808821 is 1288086.

It is not a de Polignac number, because 6808821 - 2² = 6808817 is a prime.

It is an Ulam number.

6808821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6808801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2061 + ... + 4226.

It is an arithmetic number, because the mean of its divisors is an integer number (798576).

Almost surely, 2^6808821 is an apocalyptic number.

It is an amenable number.

6808821 is a deficient number, since it is larger than the sum of its proper divisors (2774091).

6808821 is a wasteful number, since it uses less digits than its factorization.

6808821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6328 (or 6309 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 6808821 is about 2609.3717634710. The cubic root of 6808821 is about 189.5355321689.

The spelling of 6808821 in words is "six million, eight hundred eight thousand, eight hundred twenty-one".