128396918 has 16 divisors (see below), whose sum is σ = 209744640. Its totient is φ = 58593216.

The previous prime is 128396911. The next prime is 128396923. The reversal of 128396918 is 819693821.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128396911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25430 + ... + 30057.

It is an arithmetic number, because the mean of its divisors is an integer number (13109040).

Almost surely, 2^128396918 is an apocalyptic number.

128396918 is a deficient number, since it is larger than the sum of its proper divisors (81347722).

128396918 is a wasteful number, since it uses less digits than its factorization.

128396918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55591.

The product of its digits is 186624, while the sum is 47.

The square root of 128396918 is about 11331.2363844375. The cubic root of 128396918 is about 504.4888046698.

The spelling of 128396918 in words is "one hundred twenty-eight million, three hundred ninety-six thousand, nine hundred eighteen".