128571839 has 8 divisors (see below), whose sum is σ = 140378832. Its totient is φ = 116784640.

The previous prime is 128571827. The next prime is 128571857. The reversal of 128571839 is 938175821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128571839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128571839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128571869) 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 7 ways as a sum of consecutive naturals, for example, 10847 + ... + 19359.

It is an arithmetic number, because the mean of its divisors is an integer number (17547354).

Almost surely, 2^128571839 is an apocalyptic number.

128571839 is a deficient number, since it is larger than the sum of its proper divisors (11806993).

128571839 is a wasteful number, since it uses less digits than its factorization.

128571839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9897.

The product of its digits is 120960, while the sum is 44.

The square root of 128571839 is about 11338.9522884612. The cubic root of 128571839 is about 504.7177967780.

The spelling of 128571839 in words is "one hundred twenty-eight million, five hundred seventy-one thousand, eight hundred thirty-nine".