404521 has 12 divisors (see below), whose sum is σ = 463372. Its totient is φ = 350784.

The previous prime is 404513. The next prime is 404527. The reversal of 404521 is 125404.

It can be written as a sum of positive squares in 6 ways, for example, as 1296 + 403225 = 36^2 + 635^2 .

It is not a de Polignac number, because 404521 - 2³ = 404513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 404495 and 404504.

It is not an unprimeable number, because it can be changed into a prime (404527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10915 + ... + 10951.

2⁴⁰⁴⁵²¹ is an apocalyptic number.

It is an amenable number.

404521 is a deficient number, since it is larger than the sum of its proper divisors (58851).

404521 is a wasteful number, since it uses less digits than its factorization.

404521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 79 counting only the distinct ones).

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

The square root of 404521 is about 636.0196537844. The cubic root of 404521 is about 73.9571824371.

Adding to 404521 its reverse (125404), we get a palindrome (529925).

The spelling of 404521 in words is "four hundred four thousand, five hundred twenty-one".