128338438 has 16 divisors (see below), whose sum is σ = 194183136. Its totient is φ = 63613440.

The previous prime is 128338421. The next prime is 128338471. The reversal of 128338438 is 834833821.

It is a self number, because there is not a number n which added to its sum of digits gives 128338438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193828 + ... + 194488.

It is an arithmetic number, because the mean of its divisors is an integer number (12136446).

Almost surely, 2^128338438 is an apocalyptic number.

128338438 is a deficient number, since it is larger than the sum of its proper divisors (65844698).

128338438 is a wasteful number, since it uses less digits than its factorization.

128338438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359.

The product of its digits is 110592, while the sum is 40.

The square root of 128338438 is about 11328.6556130902. The cubic root of 128338438 is about 504.4122011034.

The spelling of 128338438 in words is "one hundred twenty-eight million, three hundred thirty-eight thousand, four hundred thirty-eight".