2128756 has 18 divisors (see below), whose sum is σ = 4333938. Its totient is φ = 912240.

The previous prime is 2128751. The next prime is 2128769. The reversal of 2128756 is 6578212.

2128756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1731856 + 396900 = 1316^2 + 630^2 .

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128751) 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 5 ways as a sum of consecutive naturals, for example, 5235 + ... + 5626.

2^2128756 is an apocalyptic number.

It is an amenable number.

2128756 is an abundant number, since it is smaller than the sum of its proper divisors (2205182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2128756 is a wasteful number, since it uses less digits than its factorization.

2128756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10879 (or 10870 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 2128756 is about 1459.0257023096. The cubic root of 2128756 is about 128.6397818790.

The spelling of 2128756 in words is "two million, one hundred twenty-eight thousand, seven hundred fifty-six".