118865 has 4 divisors (see below), whose sum is σ = 142644. Its totient is φ = 95088.

The previous prime is 118861. The next prime is 118873. The reversal of 118865 is 568811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568811 = 157 ⋅3623.

It can be written as a sum of positive squares in 2 ways, for example, as 35344 + 83521 = 188^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 118865 - 2² = 118861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118861) 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, 11882 + ... + 11891.

It is an arithmetic number, because the mean of its divisors is an integer number (35661).

2¹¹⁸⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

118865 is a deficient number, since it is larger than the sum of its proper divisors (23779).

118865 is an equidigital number, since it uses as much as digits as its factorization.

118865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23778.

The product of its digits is 1920, while the sum is 29.

The square root of 118865 is about 344.7680379618. The cubic root of 118865 is about 49.1682402382.

The spelling of 118865 in words is "one hundred eighteen thousand, eight hundred sixty-five".