128539138 has 32 divisors (see below), whose sum is σ = 239057280. Its totient is φ = 50474880.

The previous prime is 128539127. The next prime is 128539153. The reversal of 128539138 is 831935821.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 128539138.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22758 + ... + 27838.

It is an arithmetic number, because the mean of its divisors is an integer number (7470540).

Almost surely, 2^128539138 is an apocalyptic number.

128539138 is a deficient number, since it is larger than the sum of its proper divisors (110518142).

128539138 is a wasteful number, since it uses less digits than its factorization.

128539138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5242.

The product of its digits is 51840, while the sum is 40.

The square root of 128539138 is about 11337.5102205026. The cubic root of 128539138 is about 504.6750031246.

The spelling of 128539138 in words is "one hundred twenty-eight million, five hundred thirty-nine thousand, one hundred thirty-eight".