189173887389 has 12 divisors (see below), whose sum is σ = 273545317500. Its totient is φ = 125980164864.

The previous prime is 189173887333. The next prime is 189173887447. The reversal of 189173887389 is 983788371981.

It is a happy number.

189173887389 is a `hidden beast` number, since 18 + 91 + 7 + 388 + 73 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 38684202489 + 150489684900 = 196683^2 + 387930^2 .

It is not a de Polignac number, because 189173887389 - 2¹⁶ = 189173821853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189173887289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11304514 + ... + 11321235.

It is an arithmetic number, because the mean of its divisors is an integer number (22795443125).

Almost surely, 2^189173887389 is an apocalyptic number.

It is an amenable number.

189173887389 is a deficient number, since it is larger than the sum of its proper divisors (84371430111).

189173887389 is a wasteful number, since it uses less digits than its factorization.

189173887389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22626684 (or 22626681 counting only the distinct ones).

The product of its digits is 146313216, while the sum is 72.

The spelling of 189173887389 in words is "one hundred eighty-nine billion, one hundred seventy-three million, eight hundred eighty-seven thousand, three hundred eighty-nine".