520686 has 12 divisors (see below), whose sum is σ = 1128192. Its totient is φ = 173556.

The previous prime is 520679. The next prime is 520691. The reversal of 520686 is 686025.

It is a super-2 number, since 2×520686² = 542227821192, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14446 + ... + 14481.

It is an arithmetic number, because the mean of its divisors is an integer number (94016).

2⁵²⁰⁶⁸⁶ is an apocalyptic number.

520686 is an abundant number, since it is smaller than the sum of its proper divisors (607506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

520686 is a wasteful number, since it uses less digits than its factorization.

520686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28935 (or 28932 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 520686 is about 721.5857537396. The cubic root of 520686 is about 80.4498614006.

The spelling of 520686 in words is "five hundred twenty thousand, six hundred eighty-six".