521840804 has 12 divisors (see below), whose sum is σ = 913516800. Its totient is φ = 260836008.

The previous prime is 521840779. The next prime is 521840807. The reversal of 521840804 is 408048125.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (521840807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5984 + ... + 32855.

It is an arithmetic number, because the mean of its divisors is an integer number (76126400).

Almost surely, 2^521840804 is an apocalyptic number.

It is an amenable number.

521840804 is a deficient number, since it is larger than the sum of its proper divisors (391675996).

521840804 is a wasteful number, since it uses less digits than its factorization.

521840804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42202 (or 42200 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 521840804 is about 22843.8351421122. The cubic root of 521840804 is about 805.0929275591.

Adding to 521840804 its reverse (408048125), we get a palindrome (929888929).

The spelling of 521840804 in words is "five hundred twenty-one million, eight hundred forty thousand, eight hundred four".