520806 has 32 divisors (see below), whose sum is σ = 1225728. Its totient is φ = 145440.

The previous prime is 520787. The next prime is 520813. The reversal of 520806 is 608025.

It is a happy number.

520806 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

520806 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 555 + ... + 1161.

It is an arithmetic number, because the mean of its divisors is an integer number (38304).

2⁵²⁰⁸⁰⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (612864).

520806 is an abundant number, since it is smaller than the sum of its proper divisors (704922).

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

520806 is a wasteful number, since it uses less digits than its factorization.

520806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 520806 is about 721.6688991497. The cubic root of 520806 is about 80.4560412235.

It can be divided in two parts, 520 and 806, that added together give a triangular number (1326 = T₅₁).

The spelling of 520806 in words is "five hundred twenty thousand, eight hundred six".