188421189 has 16 divisors (see below), whose sum is σ = 274497024. Its totient is φ = 114015600.

The previous prime is 188421143. The next prime is 188421209. The reversal of 188421189 is 981124881.

It is not a de Polignac number, because 188421189 - 2⁷ = 188421061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 188421189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188421109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18672 + ... + 26934.

It is an arithmetic number, because the mean of its divisors is an integer number (17156064).

Almost surely, 2^188421189 is an apocalyptic number.

It is an amenable number.

188421189 is a deficient number, since it is larger than the sum of its proper divisors (86075835).

188421189 is a wasteful number, since it uses less digits than its factorization.

188421189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8968.

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

The square root of 188421189 is about 13726.6597903496. The cubic root of 188421189 is about 573.2929221186.

The spelling of 188421189 in words is "one hundred eighty-eight million, four hundred twenty-one thousand, one hundred eighty-nine".