9789128 has 16 divisors (see below), whose sum is σ = 18469680. Its totient is φ = 4863888.

The previous prime is 9789121. The next prime is 9789133. The reversal of 9789128 is 8219879.

9789128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9789121) 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, 2450 + ... + 5057.

It is an arithmetic number, because the mean of its divisors is an integer number (1154355).

Almost surely, 2^9789128 is an apocalyptic number.

It is an amenable number.

9789128 is a deficient number, since it is larger than the sum of its proper divisors (8680552).

9789128 is a wasteful number, since it uses less digits than its factorization.

9789128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7676 (or 7672 counting only the distinct ones).

The product of its digits is 72576, while the sum is 44.

The square root of 9789128 is about 3128.7582201250. The cubic root of 9789128 is about 213.9183314304.

The spelling of 9789128 in words is "nine million, seven hundred eighty-nine thousand, one hundred twenty-eight".