2805904 has 20 divisors (see below), whose sum is σ = 5475964. Its totient is φ = 1392768.

The previous prime is 2805899. The next prime is 2805911. The reversal of 2805904 is 4095082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 409600 + 2396304 = 640^2 + 1548^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1954 + ... + 3070.

2^2805904 is an apocalyptic number.

It is an amenable number.

2805904 is a deficient number, since it is larger than the sum of its proper divisors (2670060).

2805904 is a wasteful number, since it uses less digits than its factorization.

2805904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282 (or 1276 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2805904 is about 1675.0832815117. The cubic root of 2805904 is about 141.0449699793.

The spelling of 2805904 in words is "two million, eight hundred five thousand, nine hundred four".