189433728 has 240 divisors, whose sum is σ = 623764680. Its totient is φ = 57024000.

The previous prime is 189433721. The next prime is 189433733. The reversal of 189433728 is 827334981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189433721) 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 29 ways as a sum of consecutive naturals, for example, 1254453 + ... + 1254603.

Almost surely, 2^189433728 is an apocalyptic number.

189433728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189433728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311882340).

189433728 is an abundant number, since it is smaller than the sum of its proper divisors (434330952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189433728 is a wasteful number, since it uses less digits than its factorization.

189433728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 167 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 189433728 is about 13763.4925800104. The cubic root of 189433728 is about 574.3180098313.

The spelling of 189433728 in words is "one hundred eighty-nine million, four hundred thirty-three thousand, seven hundred twenty-eight".