521343804 has 48 divisors (see below), whose sum is σ = 1235461248. Its totient is φ = 171089088.

The previous prime is 521343799. The next prime is 521343821. The reversal of 521343804 is 408343125.

It is a super-3 number, since 3×521343804³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220959 + ... + 223305.

It is an arithmetic number, because the mean of its divisors is an integer number (25738776).

Almost surely, 2^521343804 is an apocalyptic number.

It is an amenable number.

521343804 is an abundant number, since it is smaller than the sum of its proper divisors (714117444).

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

521343804 is a wasteful number, since it uses less digits than its factorization.

521343804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634 (or 2632 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 521343804 is about 22832.9543423535. The cubic root of 521343804 is about 804.8372568148.

Adding to 521343804 its reverse (408343125), we get a palindrome (929686929).

The spelling of 521343804 in words is "five hundred twenty-one million, three hundred forty-three thousand, eight hundred four".