520384409 has 12 divisors (see below), whose sum is σ = 535529700. Its totient is φ = 505651104.

The previous prime is 520384393. The next prime is 520384411. The reversal of 520384409 is 904483025.

It can be written as a sum of positive squares in 2 ways, for example, as 501894409 + 18490000 = 22403^2 + 4300^2 .

It is not a de Polignac number, because 520384409 - 2⁴ = 520384393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520384009) 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, 422807 + ... + 424035.

It is an arithmetic number, because the mean of its divisors is an integer number (44627475).

Almost surely, 2^520384409 is an apocalyptic number.

It is an amenable number.

520384409 is a deficient number, since it is larger than the sum of its proper divisors (15145291).

520384409 is a wasteful number, since it uses less digits than its factorization.

520384409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 520384409 is about 22811.9356697322. The cubic root of 520384409 is about 804.3432571618.

The spelling of 520384409 in words is "five hundred twenty million, three hundred eighty-four thousand, four hundred nine".