189173605 has 4 divisors (see below), whose sum is σ = 227008332. Its totient is φ = 151338880.

The previous prime is 189173599. The next prime is 189173617. The reversal of 189173605 is 506371981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506371981 = 3691 ⋅137191.

It can be written as a sum of positive squares in 2 ways, for example, as 67667076 + 121506529 = 8226^2 + 11023^2 .

It is not a de Polignac number, because 189173605 - 2⁷ = 189173477 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18917356 + ... + 18917365.

It is an arithmetic number, because the mean of its divisors is an integer number (56752083).

Almost surely, 2^189173605 is an apocalyptic number.

It is an amenable number.

189173605 is a deficient number, since it is larger than the sum of its proper divisors (37834727).

189173605 is an equidigital number, since it uses as much as digits as its factorization.

189173605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37834726.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 189173605 is about 13754.0395884264. The cubic root of 189173605 is about 574.0550123918.

It can be divided in two parts, 18917 and 3605, that added together give a palindrome (22522).

The spelling of 189173605 in words is "one hundred eighty-nine million, one hundred seventy-three thousand, six hundred five".