520397507 has 16 divisors (see below), whose sum is σ = 602795520. Its totient is φ = 440037312.

The previous prime is 520397503. The next prime is 520397539. The reversal of 520397507 is 705793025.

It is a cyclic number.

It is not a de Polignac number, because 520397507 - 2² = 520397503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520397503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424898 + ... + 426120.

It is an arithmetic number, because the mean of its divisors is an integer number (37674720).

Almost surely, 2^520397507 is an apocalyptic number.

520397507 is a deficient number, since it is larger than the sum of its proper divisors (82398013).

520397507 is a wasteful number, since it uses less digits than its factorization.

520397507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002.

The product of its (nonzero) digits is 66150, while the sum is 38.

The square root of 520397507 is about 22812.2227544797. Note that the first 3 decimals coincide. The cubic root of 520397507 is about 804.3500055062.

The spelling of 520397507 in words is "five hundred twenty million, three hundred ninety-seven thousand, five hundred seven".