128843713 has 4 divisors (see below), whose sum is σ = 129497940. Its totient is φ = 128189488.

The previous prime is 128843711. The next prime is 128843717. The reversal of 128843713 is 317348821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 317348821 = 383 ⋅828587.

It can be written as a sum of positive squares in 2 ways, for example, as 118526769 + 10316944 = 10887^2 + 3212^2 .

It is a cyclic number.

It is not a de Polignac number, because 128843713 - 2¹ = 128843711 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128843711) 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, 326818 + ... + 327211.

It is an arithmetic number, because the mean of its divisors is an integer number (32374485).

Almost surely, 2^128843713 is an apocalyptic number.

It is an amenable number.

128843713 is a deficient number, since it is larger than the sum of its proper divisors (654227).

128843713 is an equidigital number, since it uses as much as digits as its factorization.

128843713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654226.

The product of its digits is 32256, while the sum is 37.

The square root of 128843713 is about 11350.9344549248. The cubic root of 128843713 is about 505.0732998199.

The spelling of 128843713 in words is "one hundred twenty-eight million, eight hundred forty-three thousand, seven hundred thirteen".