128385536939 has 4 divisors (see below), whose sum is σ = 140056949400. Its totient is φ = 116714124480.

The previous prime is 128385536927. The next prime is 128385536963. The reversal of 128385536939 is 939635583821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128385536939 - 2¹² = 128385532843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128385536969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5835706214 + ... + 5835706235.

It is an arithmetic number, because the mean of its divisors is an integer number (35014237350).

Almost surely, 2^128385536939 is an apocalyptic number.

128385536939 is a deficient number, since it is larger than the sum of its proper divisors (11671412461).

128385536939 is a wasteful number, since it uses less digits than its factorization.

128385536939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11671412460.

The product of its digits is 41990400, while the sum is 62.

The spelling of 128385536939 in words is "one hundred twenty-eight billion, three hundred eighty-five million, five hundred thirty-six thousand, nine hundred thirty-nine".