1728912189 has 32 divisors (see below), whose sum is σ = 2484953856. Its totient is φ = 1065369600.

The previous prime is 1728912179. The next prime is 1728912221. The reversal of 1728912189 is 9812198271.

It is not a de Polignac number, because 1728912189 - 2¹⁹ = 1728387901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728912179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 676464 + ... + 679014.

It is an arithmetic number, because the mean of its divisors is an integer number (77654808).

Almost surely, 2^1728912189 is an apocalyptic number.

It is an amenable number.

1728912189 is a deficient number, since it is larger than the sum of its proper divisors (756041667).

1728912189 is a wasteful number, since it uses less digits than its factorization.

1728912189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805.

The product of its digits is 145152, while the sum is 48.

The square root of 1728912189 is about 41580.1898624814. The cubic root of 1728912189 is about 1200.2111177167.

The spelling of 1728912189 in words is "one billion, seven hundred twenty-eight million, nine hundred twelve thousand, one hundred eighty-nine".