128381912 has 24 divisors (see below), whose sum is σ = 248746500. Its totient is φ = 62116560.

The previous prime is 128381867. The next prime is 128381933. The reversal of 128381912 is 219183821.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 662 + ... + 16037.

Almost surely, 2^128381912 is an apocalyptic number.

It is an amenable number.

128381912 is a deficient number, since it is larger than the sum of its proper divisors (120364588).

128381912 is a wasteful number, since it uses less digits than its factorization.

128381912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16767 (or 16732 counting only the distinct ones).

The product of its digits is 6912, while the sum is 35.

The square root of 128381912 is about 11330.5742131632. The cubic root of 128381912 is about 504.4691503716.

The spelling of 128381912 in words is "one hundred twenty-eight million, three hundred eighty-one thousand, nine hundred twelve".