128406388 has 12 divisors (see below), whose sum is σ = 245139552. Its totient is φ = 58366520.

The previous prime is 128406379. The next prime is 128406407. The reversal of 128406388 is 883604821.

It is a self number, because there is not a number n which added to its sum of digits gives 128406388.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1459120 + ... + 1459207.

It is an arithmetic number, because the mean of its divisors is an integer number (20428296).

Almost surely, 2^128406388 is an apocalyptic number.

It is an amenable number.

128406388 is a deficient number, since it is larger than the sum of its proper divisors (116733164).

128406388 is a wasteful number, since it uses less digits than its factorization.

128406388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918342 (or 2918340 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 128406388 is about 11331.6542481669. The cubic root of 128406388 is about 504.5012073339.

The spelling of 128406388 in words is "one hundred twenty-eight million, four hundred six thousand, three hundred eighty-eight".