188889 has 8 divisors (see below), whose sum is σ = 255360. Its totient is φ = 124176.

The previous prime is 188869. The next prime is 188891. The reversal of 188889 is 988881.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 188889 - 2⁵ = 188857 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

188889 is a lucky number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 188889.

It is not an unprimeable number, because it can be changed into a prime (188869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162 + ... + 635.

It is an arithmetic number, because the mean of its divisors is an integer number (31920).

2¹⁸⁸⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

188889 is a deficient number, since it is larger than the sum of its proper divisors (66471).

188889 is an equidigital number, since it uses as much as digits as its factorization.

188889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879.

The product of its digits is 36864, while the sum is 42.

The square root of 188889 is about 434.6136215077. The cubic root of 188889 is about 57.3766986079.

The spelling of 188889 in words is "one hundred eighty-eight thousand, eight hundred eighty-nine".