188396928 has 128 divisors (see below), whose sum is σ = 563733600. Its totient is φ = 62705664.

The previous prime is 188396917. The next prime is 188396953. The reversal of 188396928 is 829693881.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279600 + ... + 280272.

Almost surely, 2^188396928 is an apocalyptic number.

188396928 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 188396928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281866800).

188396928 is an abundant number, since it is smaller than the sum of its proper divisors (375336672).

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

188396928 is an frugal number, since it uses more digits than its factorization.

188396928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708 (or 678 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 188396928 is about 13725.7760436341. The cubic root of 188396928 is about 573.2683154442.

The spelling of 188396928 in words is "one hundred eighty-eight million, three hundred ninety-six thousand, nine hundred twenty-eight".