520421404 has 6 divisors (see below), whose sum is σ = 910737464. Its totient is φ = 260210700.

The previous prime is 520421399. The next prime is 520421411. The reversal of 520421404 is 404124025.

It is a happy number.

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, 65052672 + ... + 65052679.

Almost surely, 2^520421404 is an apocalyptic number.

It is an amenable number.

520421404 is a deficient number, since it is larger than the sum of its proper divisors (390316060).

520421404 is a wasteful number, since it uses less digits than its factorization.

520421404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130105355 (or 130105353 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 520421404 is about 22812.7465246954. The cubic root of 520421404 is about 804.3623174136.

Adding to 520421404 its reverse (404124025), we get a palindrome (924545429).

The spelling of 520421404 in words is "five hundred twenty million, four hundred twenty-one thousand, four hundred four".