128239388 has 12 divisors (see below), whose sum is σ = 226941120. Its totient is φ = 63399072.

The previous prime is 128239387. The next prime is 128239403. The reversal of 128239388 is 883932821.

It is a super-2 number, since 2×128239388² = 32890681269229088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128239387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179756 + ... + 180467.

It is an arithmetic number, because the mean of its divisors is an integer number (18911760).

Almost surely, 2^128239388 is an apocalyptic number.

It is an amenable number.

128239388 is a deficient number, since it is larger than the sum of its proper divisors (98701732).

128239388 is a wasteful number, since it uses less digits than its factorization.

128239388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360316 (or 360314 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 128239388 is about 11324.2831119678. The cubic root of 128239388 is about 504.2824013641.

The spelling of 128239388 in words is "one hundred twenty-eight million, two hundred thirty-nine thousand, three hundred eighty-eight".