6821872 has 20 divisors (see below), whose sum is σ = 13258080. Its totient is φ = 3400448.

The previous prime is 6821863. The next prime is 6821897. The reversal of 6821872 is 2781286.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9129 + ... + 9847.

It is an arithmetic number, because the mean of its divisors is an integer number (662904).

Almost surely, 2^6821872 is an apocalyptic number.

It is an amenable number.

6821872 is a deficient number, since it is larger than the sum of its proper divisors (6436208).

6821872 is a wasteful number, since it uses less digits than its factorization.

6821872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320 (or 1314 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 6821872 is about 2611.8713597725. The cubic root of 6821872 is about 189.6565540730.

The spelling of 6821872 in words is "six million, eight hundred twenty-one thousand, eight hundred seventy-two".