2128745 has 16 divisors (see below), whose sum is σ = 2702160. Its totient is φ = 1607424.

The previous prime is 2128733. The next prime is 2128747. The reversal of 2128745 is 5478212.

2128745 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 8 ways, for example, as 32041 + 2096704 = 179^2 + 1448^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128745 - 2¹⁰ = 2127721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128747) 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 15 ways as a sum of consecutive naturals, for example, 7547 + ... + 7823.

It is an arithmetic number, because the mean of its divisors is an integer number (168885).

2^2128745 is an apocalyptic number.

It is an amenable number.

2128745 is a deficient number, since it is larger than the sum of its proper divisors (573415).

2128745 is a wasteful number, since it uses less digits than its factorization.

2128745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364.

The product of its digits is 4480, while the sum is 29.

The square root of 2128745 is about 1459.0219326659. The cubic root of 2128745 is about 128.6395603036.

The spelling of 2128745 in words is "two million, one hundred twenty-eight thousand, seven hundred forty-five".