523866 has 16 divisors (see below), whose sum is σ = 1197504. Its totient is φ = 149664.

The previous prime is 523847. The next prime is 523867. The reversal of 523866 is 668325.

It is an Ulam number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (523867) by changing a digit.

523866 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 7 ways as a sum of consecutive naturals, for example, 6195 + ... + 6278.

It is an arithmetic number, because the mean of its divisors is an integer number (74844).

523866 is a Friedman number, since it can be written as (8^6-6^3+5)*2, using all its digits and the basic arithmetic operations.

2⁵²³⁸⁶⁶ is an apocalyptic number.

523866 is an abundant number, since it is smaller than the sum of its proper divisors (673638).

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

523866 is a wasteful number, since it uses less digits than its factorization.

523866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12485.

The product of its digits is 8640, while the sum is 30.

The square root of 523866 is about 723.7858799396. The cubic root of 523866 is about 80.6133069996.

It can be divided in two parts, 5 and 23866, that added together give a triangular number (23871 = T₂₁₈).

The spelling of 523866 in words is "five hundred twenty-three thousand, eight hundred sixty-six".