520815 has 8 divisors (see below), whose sum is σ = 833328. Its totient is φ = 277760.

The previous prime is 520813. The next prime is 520837. The reversal of 520815 is 518025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520815 - 2¹ = 520813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 520791 and 520800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17346 + ... + 17375.

It is an arithmetic number, because the mean of its divisors is an integer number (104166).

2⁵²⁰⁸¹⁵ is an apocalyptic number.

520815 is a deficient number, since it is larger than the sum of its proper divisors (312513).

520815 is a wasteful number, since it uses less digits than its factorization.

520815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34729.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 520815 is about 721.6751346693. The cubic root of 520815 is about 80.4565046720.

The spelling of 520815 in words is "five hundred twenty thousand, eight hundred fifteen".