523904 has 16 divisors (see below), whose sum is σ = 1043970. Its totient is φ = 261888.

The previous prime is 523903. The next prime is 523907. The reversal of 523904 is 409325.

It can be written as a sum of positive squares in only one way, i.e., 462400 + 61504 = 680^2 + 248^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 523904.

It is not an unprimeable number, because it can be changed into a prime (523903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1919 + ... + 2174.

2⁵²³⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

523904 is a deficient number, since it is larger than the sum of its proper divisors (520066).

523904 is an equidigital number, since it uses as much as digits as its factorization.

523904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4107 (or 4095 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 523904 is about 723.8121303211. The cubic root of 523904 is about 80.6152561187.

The spelling of 523904 in words is "five hundred twenty-three thousand, nine hundred four".