2656404 has 36 divisors (see below), whose sum is σ = 6784596. Its totient is φ = 876288.

The previous prime is 2656399. The next prime is 2656417. The reversal of 2656404 is 4046562.

It is a happy number.

2656404 is a `hidden beast` number, since 2 + 656 + 4 + 0 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 260100 + 2396304 = 510^2 + 1548^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×2656404² = 14112964422432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3742 + ... + 4394.

It is an arithmetic number, because the mean of its divisors is an integer number (188461).

2^2656404 is an apocalyptic number.

It is an amenable number.

2656404 is an abundant number, since it is smaller than the sum of its proper divisors (4128192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2656404 is a wasteful number, since it uses less digits than its factorization.

2656404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 2656404 is about 1629.8478456592. The cubic root of 2656404 is about 138.4941327824.

The spelling of 2656404 in words is "two million, six hundred fifty-six thousand, four hundred four".