188865 has 16 divisors (see below), whose sum is σ = 336000. Its totient is φ = 100656.

The previous prime is 188863. The next prime is 188869. The reversal of 188865 is 568881.

It is not a de Polignac number, because 188865 - 2¹ = 188863 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (188861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 565 + ... + 834.

It is an arithmetic number, because the mean of its divisors is an integer number (21000).

2¹⁸⁸⁸⁶⁵ is an apocalyptic number.

188865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

188865 is a deficient number, since it is larger than the sum of its proper divisors (147135).

188865 is a wasteful number, since it uses less digits than its factorization.

188865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413 (or 1407 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 188865 is about 434.5860098991. The cubic root of 188865 is about 57.3742684344.

It can be divided in two parts, 1888 and 65, that added together give a triangular number (1953 = T₆₂).

The spelling of 188865 in words is "one hundred eighty-eight thousand, eight hundred sixty-five".