128843901 has 24 divisors (see below), whose sum is σ = 200786040. Its totient is φ = 79312896.

The previous prime is 128843863. The next prime is 128843903. The reversal of 128843901 is 109348821.

It can be written as a sum of positive squares in 4 ways, for example, as 30239001 + 98604900 = 5499^2 + 9930^2 .

It is not a de Polignac number, because 128843901 - 2¹⁸ = 128581757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128843903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165 + ... + 16053.

It is an arithmetic number, because the mean of its divisors is an integer number (8366085).

Almost surely, 2^128843901 is an apocalyptic number.

It is an amenable number.

128843901 is a deficient number, since it is larger than the sum of its proper divisors (71942139).

128843901 is a wasteful number, since it uses less digits than its factorization.

128843901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15965 (or 15962 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 128843901 is about 11350.9427361783. The cubic root of 128843901 is about 505.0735454760.

The spelling of 128843901 in words is "one hundred twenty-eight million, eight hundred forty-three thousand, nine hundred one".