189371789 has 8 divisors (see below), whose sum is σ = 204778368. Its totient is φ = 174439360.

The previous prime is 189371771. The next prime is 189371807. The reversal of 189371789 is 987173981.

189371789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (189371771) and next prime (189371807).

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 189371789 - 2¹² = 189367693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 189371789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189371729) 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, 117707 + ... + 119304.

It is an arithmetic number, because the mean of its divisors is an integer number (25597296).

Almost surely, 2^189371789 is an apocalyptic number.

It is an amenable number.

189371789 is a deficient number, since it is larger than the sum of its proper divisors (15406579).

189371789 is a wasteful number, since it uses less digits than its factorization.

189371789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237075.

The product of its digits is 762048, while the sum is 53.

The square root of 189371789 is about 13761.2422767714. The cubic root of 189371789 is about 574.2554082356.

The spelling of 189371789 in words is "one hundred eighty-nine million, three hundred seventy-one thousand, seven hundred eighty-nine".