128843899 has 4 divisors (see below), whose sum is σ = 129120264. Its totient is φ = 128567536.

The previous prime is 128843863. The next prime is 128843903. The reversal of 128843899 is 998348821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128843899 - 2⁹ = 128843387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128843809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137482 + ... + 138415.

It is an arithmetic number, because the mean of its divisors is an integer number (32280066).

Almost surely, 2^128843899 is an apocalyptic number.

128843899 is a deficient number, since it is larger than the sum of its proper divisors (276365).

128843899 is an equidigital number, since it uses as much as digits as its factorization.

128843899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276364.

The product of its digits is 995328, while the sum is 52.

The square root of 128843899 is about 11350.9426480799. The cubic root of 128843899 is about 505.0735428627.

The spelling of 128843899 in words is "one hundred twenty-eight million, eight hundred forty-three thousand, eight hundred ninety-nine".