189818 has 8 divisors (see below), whose sum is σ = 287712. Its totient is φ = 93916.

The previous prime is 189817. The next prime is 189823. The reversal of 189818 is 818981.

189818 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230 + ... + 657.

It is an arithmetic number, because the mean of its divisors is an integer number (35964).

2¹⁸⁹⁸¹⁸ is an apocalyptic number.

189818 is a deficient number, since it is larger than the sum of its proper divisors (97894).

189818 is a wasteful number, since it uses less digits than its factorization.

189818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996.

The product of its digits is 4608, while the sum is 35.

The square root of 189818 is about 435.6810760178. The cubic root of 189818 is about 57.4706087977.

The spelling of 189818 in words is "one hundred eighty-nine thousand, eight hundred eighteen".