520404 has 24 divisors (see below), whose sum is σ = 1286208. Its totient is φ = 163200.

The previous prime is 520393. The next prime is 520409. The reversal of 520404 is 404025.

520404 is a modest number, since divided by 404 gives 52 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520409) 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 in 7 ways as a sum of consecutive naturals, for example, 1072 + ... + 1479.

It is an arithmetic number, because the mean of its divisors is an integer number (53592).

2⁵²⁰⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

520404 is an abundant number, since it is smaller than the sum of its proper divisors (765804).

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

520404 is a wasteful number, since it uses less digits than its factorization.

520404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575 (or 2573 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 520404 is about 721.3903243044. The cubic root of 520404 is about 80.4353350784.

Adding to 520404 its reverse (404025), we get a palindrome (924429).

The spelling of 520404 in words is "five hundred twenty thousand, four hundred four".