128203289 has 4 divisors (see below), whose sum is σ = 128226000. Its totient is φ = 128180580.

The previous prime is 128203247. The next prime is 128203297. The reversal of 128203289 is 982302821.

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: 982302821 = 71 ⋅13835251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128203289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128203189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4394 + ... + 16604.

It is an arithmetic number, because the mean of its divisors is an integer number (32056500).

Almost surely, 2^128203289 is an apocalyptic number.

It is an amenable number.

128203289 is a deficient number, since it is larger than the sum of its proper divisors (22711).

128203289 is a wasteful number, since it uses less digits than its factorization.

128203289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22710.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 128203289 is about 11322.6891240553. The cubic root of 128203289 is about 504.2350789330.

The spelling of 128203289 in words is "one hundred twenty-eight million, two hundred three thousand, two hundred eighty-nine".