128934839 has 4 divisors (see below), whose sum is σ = 140656200. Its totient is φ = 117213480.

The previous prime is 128934833. The next prime is 128934847. The reversal of 128934839 is 938439821.

It is a happy number.

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 128934839 - 2²⁴ = 112157623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128934793 and 128934802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128934833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5860664 + ... + 5860685.

It is an arithmetic number, because the mean of its divisors is an integer number (35164050).

Almost surely, 2^128934839 is an apocalyptic number.

128934839 is a deficient number, since it is larger than the sum of its proper divisors (11721361).

128934839 is a wasteful number, since it uses less digits than its factorization.

128934839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11721360.

The product of its digits is 373248, while the sum is 47.

The square root of 128934839 is about 11354.9477761899. The cubic root of 128934839 is about 505.1923444673.

The spelling of 128934839 in words is "one hundred twenty-eight million, nine hundred thirty-four thousand, eight hundred thirty-nine".