6865821 has 12 divisors (see below), whose sum is σ = 10439520. Its totient is φ = 4336200.

The previous prime is 6865769. The next prime is 6865847. The reversal of 6865821 is 1285686.

It is a happy number.

6865821 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6865821 - 2⁷ = 6865693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6865861) 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, 19905 + ... + 20246.

It is an arithmetic number, because the mean of its divisors is an integer number (869960).

Almost surely, 2^6865821 is an apocalyptic number.

It is an amenable number.

6865821 is a deficient number, since it is larger than the sum of its proper divisors (3573699).

6865821 is a wasteful number, since it uses less digits than its factorization.

6865821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40176 (or 40173 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 6865821 is about 2620.2711691731. The cubic root of 6865821 is about 190.0629615898.

The spelling of 6865821 in words is "six million, eight hundred sixty-five thousand, eight hundred twenty-one".