521840836 has 24 divisors (see below), whose sum is σ = 1039558464. Its totient is φ = 226886880.

The previous prime is 521840807. The next prime is 521840843. The reversal of 521840836 is 638048125.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 521840795 and 521840804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256815 + ... + 258838.

It is an arithmetic number, because the mean of its divisors is an integer number (43314936).

Almost surely, 2^521840836 is an apocalyptic number.

It is an amenable number.

521840836 is a deficient number, since it is larger than the sum of its proper divisors (517717628).

521840836 is a wasteful number, since it uses less digits than its factorization.

521840836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515691 (or 515689 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 521840836 is about 22843.8358425200. The cubic root of 521840836 is about 805.0929440155.

The spelling of 521840836 in words is "five hundred twenty-one million, eight hundred forty thousand, eight hundred thirty-six".