2128789 has 4 divisors (see below), whose sum is σ = 2292556. Its totient is φ = 1965024.

The previous prime is 2128783. The next prime is 2128799. The reversal of 2128789 is 9878212.

2128789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 260100 + 1868689 = 510^2 + 1367^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128789 - 2³ = 2128781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81864 + ... + 81889.

It is an arithmetic number, because the mean of its divisors is an integer number (573139).

2^2128789 is an apocalyptic number.

It is an amenable number.

2128789 is a deficient number, since it is larger than the sum of its proper divisors (163767).

2128789 is a wasteful number, since it uses less digits than its factorization.

2128789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163766.

The product of its digits is 16128, while the sum is 37.

The square root of 2128789 is about 1459.0370111824. The cubic root of 2128789 is about 128.6404466007.

The spelling of 2128789 in words is "two million, one hundred twenty-eight thousand, seven hundred eighty-nine".