520866 has 24 divisors (see below), whose sum is σ = 1188720. Its totient is φ = 164376.

The previous prime is 520853. The next prime is 520867. The reversal of 520866 is 668025.

It is not an unprimeable number, because it can be changed into a prime (520867) by changing a digit.

520866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 420 + ... + 1103.

It is an arithmetic number, because the mean of its divisors is an integer number (49530).

2⁵²⁰⁸⁶⁶ is an apocalyptic number.

520866 is an abundant number, since it is smaller than the sum of its proper divisors (667854).

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

520866 is a wasteful number, since it uses less digits than its factorization.

520866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550 (or 1547 counting only the distinct ones).

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

The square root of 520866 is about 721.7104682627. The cubic root of 520866 is about 80.4591307790.

The spelling of 520866 in words is "five hundred twenty thousand, eight hundred sixty-six".