521404 has 24 divisors (see below), whose sum is σ = 1012928. Its totient is φ = 233280.

The previous prime is 521401. The next prime is 521429. The reversal of 521404 is 404125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1789 + ... + 2059.

2⁵²¹⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

521404 is a deficient number, since it is larger than the sum of its proper divisors (491524).

521404 is a wasteful number, since it uses less digits than its factorization.

521404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 521404 is about 722.0830977111. The cubic root of 521404 is about 80.4868231972.

Adding to 521404 its reverse (404125), we get a palindrome (925529).

The spelling of 521404 in words is "five hundred twenty-one thousand, four hundred four".