2128928 has 12 divisors (see below), whose sum is σ = 4191390. Its totient is φ = 1064448.

The previous prime is 2128891. The next prime is 2128933. The reversal of 2128928 is 8298212.

It can be written as a sum of positive squares in only one way, i.e., 1507984 + 620944 = 1228^2 + 788^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 66529 = 2128928 / (2 + 1 + 2 + 8 + 9 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 2128894 and 2128903.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33233 + ... + 33296.

2^2128928 is an apocalyptic number.

It is an amenable number.

2128928 is a deficient number, since it is larger than the sum of its proper divisors (2062462).

2128928 is an equidigital number, since it uses as much as digits as its factorization.

2128928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66539 (or 66531 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 2128928 is about 1459.0846445632. The cubic root of 2128928 is about 128.6432464136.

The spelling of 2128928 in words is "two million, one hundred twenty-eight thousand, nine hundred twenty-eight".