189819889 has 8 divisors (see below), whose sum is σ = 217047488. Its totient is φ = 162619920.

The previous prime is 189819859. The next prime is 189819901. The reversal of 189819889 is 988918981.

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

It is a cyclic number.

It is not a de Polignac number, because 189819889 - 2¹¹ = 189817841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189819859) 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, 10879 + ... + 22315.

It is an arithmetic number, because the mean of its divisors is an integer number (27130936).

Almost surely, 2^189819889 is an apocalyptic number.

It is an amenable number.

189819889 is a deficient number, since it is larger than the sum of its proper divisors (27227599).

189819889 is a wasteful number, since it uses less digits than its factorization.

189819889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13815.

The product of its digits is 2985984, while the sum is 61.

The square root of 189819889 is about 13777.5138903940. The cubic root of 189819889 is about 574.7079943933.

The spelling of 189819889 in words is "one hundred eighty-nine million, eight hundred nineteen thousand, eight hundred eighty-nine".