115985 has 4 divisors (see below), whose sum is σ = 139188. Its totient is φ = 92784.

The previous prime is 115981. The next prime is 115987. The reversal of 115985 is 589511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16129 + 99856 = 127^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 115985 - 2² = 115981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11594 + ... + 11603.

It is an arithmetic number, because the mean of its divisors is an integer number (34797).

2¹¹⁵⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

115985 is a deficient number, since it is larger than the sum of its proper divisors (23203).

115985 is an equidigital number, since it uses as much as digits as its factorization.

115985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23202.

The product of its digits is 1800, while the sum is 29.

The square root of 115985 is about 340.5657058484. The cubic root of 115985 is about 48.7678873654.

The spelling of 115985 in words is "one hundred fifteen thousand, nine hundred eighty-five".