128389392 has 30 divisors (see below), whose sum is σ = 359312382. Its totient is φ = 42796416.

The previous prime is 128389367. The next prime is 128389439. The reversal of 128389392 is 293983821.

It can be written as a sum of positive squares in only one way, i.e., 67174416 + 61214976 = 8196^2 + 7824^2 .

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

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 445653 + ... + 445940.

Almost surely, 2^128389392 is an apocalyptic number.

128389392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128389392 is an abundant number, since it is smaller than the sum of its proper divisors (230922990).

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

128389392 is a wasteful number, since it uses less digits than its factorization.

128389392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891607 (or 891598 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 128389392 is about 11330.9042887141. The cubic root of 128389392 is about 504.4789475876.

The spelling of 128389392 in words is "one hundred twenty-eight million, three hundred eighty-nine thousand, three hundred ninety-two".