6904021 has 4 divisors (see below), whose sum is σ = 6909292. Its totient is φ = 6898752.

The previous prime is 6903977. The next prime is 6904033. The reversal of 6904021 is 1204096.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4901796 + 2002225 = 2214^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 6904021 - 2¹⁵ = 6871253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6903983 and 6904001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6904081) 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, 1021 + ... + 3853.

It is an arithmetic number, because the mean of its divisors is an integer number (1727323).

Almost surely, 2^6904021 is an apocalyptic number.

It is an amenable number.

6904021 is a deficient number, since it is larger than the sum of its proper divisors (5271).

6904021 is a wasteful number, since it uses less digits than its factorization.

6904021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 6904021 is about 2627.5503801069. The cubic root of 6904021 is about 190.4148001377.

The spelling of 6904021 in words is "six million, nine hundred four thousand, twenty-one".