189045889 has 4 divisors (see below), whose sum is σ = 190425924. Its totient is φ = 187665856.

The previous prime is 189045887. The next prime is 189045911. The reversal of 189045889 is 988540981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988540981 = 67 ⋅14754343.

It can be written as a sum of positive squares in 2 ways, for example, as 127690000 + 61355889 = 11300^2 + 7833^2 .

It is a cyclic number.

It is not a de Polignac number, because 189045889 - 2¹ = 189045887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189045881) 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, 689812 + ... + 690085.

It is an arithmetic number, because the mean of its divisors is an integer number (47606481).

Almost surely, 2^189045889 is an apocalyptic number.

It is an amenable number.

189045889 is a deficient number, since it is larger than the sum of its proper divisors (1380035).

189045889 is a wasteful number, since it uses less digits than its factorization.

189045889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380034.

The product of its (nonzero) digits is 829440, while the sum is 52.

The square root of 189045889 is about 13749.3959503681. The cubic root of 189045889 is about 573.9257968399.

The spelling of 189045889 in words is "one hundred eighty-nine million, forty-five thousand, eight hundred eighty-nine".