128838040841 has 4 divisors (see below), whose sum is σ = 128838941712. Its totient is φ = 128837139972.

The previous prime is 128838040831. The next prime is 128838040847. The reversal of 128838040841 is 148040838821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 148040838821 = 23563 ⋅6282767.

It is a cyclic number.

It is not a de Polignac number, because 128838040841 - 2¹⁸ = 128837778697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128838040847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182975 + ... + 539588.

It is an arithmetic number, because the mean of its divisors is an integer number (32209735428).

Almost surely, 2^128838040841 is an apocalyptic number.

It is an amenable number.

128838040841 is a deficient number, since it is larger than the sum of its proper divisors (900871).

128838040841 is an equidigital number, since it uses as much as digits as its factorization.

128838040841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900870.

The product of its (nonzero) digits is 393216, while the sum is 47.

The spelling of 128838040841 in words is "one hundred twenty-eight billion, eight hundred thirty-eight million, forty thousand, eight hundred forty-one".