188885889 has 6 divisors (see below), whose sum is σ = 272835186. Its totient is φ = 125923920.

The previous prime is 188885881. The next prime is 188885891. The reversal of 188885889 is 988588881.

It can be written as a sum of positive squares in only one way, i.e., 163635264 + 25250625 = 12792^2 + 5025^2 .

It is not a de Polignac number, because 188885889 - 2³ = 188885881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (188885881) 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 5 ways as a sum of consecutive naturals, for example, 10493652 + ... + 10493669.

It is an arithmetic number, because the mean of its divisors is an integer number (45472531).

Almost surely, 2^188885889 is an apocalyptic number.

It is an amenable number.

188885889 is a deficient number, since it is larger than the sum of its proper divisors (83949297).

188885889 is a wasteful number, since it uses less digits than its factorization.

188885889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20987327 (or 20987324 counting only the distinct ones).

The product of its digits is 11796480, while the sum is 63.

The square root of 188885889 is about 13743.5762813032. The cubic root of 188885889 is about 573.7638360825.

The spelling of 188885889 in words is "one hundred eighty-eight million, eight hundred eighty-five thousand, eight hundred eighty-nine".