2128897 has 4 divisors (see below), whose sum is σ = 2165040. Its totient is φ = 2092756.

The previous prime is 2128891. The next prime is 2128933. The reversal of 2128897 is 7988212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2128897 - 2⁷ = 2128769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2128891) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 17983 + ... + 18100.

It is an arithmetic number, because the mean of its divisors is an integer number (541260).

2^2128897 is an apocalyptic number.

It is an amenable number.

2128897 is a deficient number, since it is larger than the sum of its proper divisors (36143).

2128897 is an equidigital number, since it uses as much as digits as its factorization.

2128897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36142.

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

The square root of 2128897 is about 1459.0740214259. The cubic root of 2128897 is about 128.6426220055.

It can be divided in two parts, 2128 and 897, that added together give a square (3025 = 55²).

The spelling of 2128897 in words is "two million, one hundred twenty-eight thousand, eight hundred ninety-seven".