128838938 has 32 divisors (see below), whose sum is σ = 206184960. Its totient is φ = 60278400.

The previous prime is 128838911. The next prime is 128838973. The reversal of 128838938 is 839838821.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 411470 + ... + 411782.

It is an arithmetic number, because the mean of its divisors is an integer number (6443280).

Almost surely, 2^128838938 is an apocalyptic number.

128838938 is a deficient number, since it is larger than the sum of its proper divisors (77346022).

128838938 is a wasteful number, since it uses less digits than its factorization.

128838938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542.

The product of its digits is 663552, while the sum is 50.

The square root of 128838938 is about 11350.7241178702. The cubic root of 128838938 is about 505.0670603361.

The spelling of 128838938 in words is "one hundred twenty-eight million, eight hundred thirty-eight thousand, nine hundred thirty-eight".