128243388 has 144 divisors (see below), whose sum is σ = 395041920. Its totient is φ = 32006016.

The previous prime is 128243363. The next prime is 128243389. The reversal of 128243388 is 883342821.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128243389) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144795 + ... + 145677.

Almost surely, 2^128243388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128243388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197520960).

128243388 is an abundant number, since it is smaller than the sum of its proper divisors (266798532).

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

128243388 is a wasteful number, since it uses less digits than its factorization.

128243388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936 (or 927 counting only the distinct ones).

The product of its digits is 73728, while the sum is 39.

The square root of 128243388 is about 11324.4597222119. The cubic root of 128243388 is about 504.2876444454.

The spelling of 128243388 in words is "one hundred twenty-eight million, two hundred forty-three thousand, three hundred eighty-eight".