115866 has 24 divisors (see below), whose sum is σ = 258804. Its totient is φ = 37440.

The previous prime is 115861. The next prime is 115873. The reversal of 115866 is 668511.

It can be written as a sum of positive squares in 2 ways, for example, as 99225 + 16641 = 315^2 + 129^2 .

It is not an unprimeable number, because it can be changed into a prime (115861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 660 + ... + 816.

2¹¹⁵⁸⁶⁶ is an apocalyptic number.

115866 is an abundant number, since it is smaller than the sum of its proper divisors (142938).

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

115866 is a wasteful number, since it uses less digits than its factorization.

115866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 203 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 115866 is about 340.3909517011. The cubic root of 115866 is about 48.7512031261.

The spelling of 115866 in words is "one hundred fifteen thousand, eight hundred sixty-six".