128841839 has 4 divisors (see below), whose sum is σ = 147247824. Its totient is φ = 110435856.

The previous prime is 128841767. The next prime is 128841851. The reversal of 128841839 is 938148821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938148821 = 503 ⋅1865107.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128841839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128841839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128841439) 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, 9202982 + ... + 9202995.

It is an arithmetic number, because the mean of its divisors is an integer number (36811956).

Almost surely, 2^128841839 is an apocalyptic number.

128841839 is a deficient number, since it is larger than the sum of its proper divisors (18405985).

128841839 is an equidigital number, since it uses as much as digits as its factorization.

128841839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18405984.

The product of its digits is 110592, while the sum is 44.

The square root of 128841839 is about 11350.8519063549. The cubic root of 128841839 is about 505.0708510859.

The spelling of 128841839 in words is "one hundred twenty-eight million, eight hundred forty-one thousand, eight hundred thirty-nine".