2205904 has 10 divisors (see below), whose sum is σ = 4273970. Its totient is φ = 1102944.

The previous prime is 2205893. The next prime is 2205911. The reversal of 2205904 is 4095022.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1299600 + 906304 = 1140^2 + 952^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68919 + ... + 68950.

It is an arithmetic number, because the mean of its divisors is an integer number (427397).

2^2205904 is an apocalyptic number.

It is an amenable number.

2205904 is a deficient number, since it is larger than the sum of its proper divisors (2068066).

2205904 is a wasteful number, since it uses less digits than its factorization.

2205904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137877 (or 137871 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2205904 is about 1485.2286019330. The cubic root of 2205904 is about 130.1753845819.

The spelling of 2205904 in words is "two million, two hundred five thousand, nine hundred four".