2128889 has 4 divisors (see below), whose sum is σ = 2433024. Its totient is φ = 1824756.

The previous prime is 2128873. The next prime is 2128891. The reversal of 2128889 is 9888212.

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 2128889 - 2⁴ = 2128873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2128849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152057 + ... + 152070.

It is an arithmetic number, because the mean of its divisors is an integer number (608256).

2^2128889 is an apocalyptic number.

It is an amenable number.

2128889 is a deficient number, since it is larger than the sum of its proper divisors (304135).

2128889 is an equidigital number, since it uses as much as digits as its factorization.

2128889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304134.

The product of its digits is 18432, while the sum is 38.

The square root of 2128889 is about 1459.0712799586. The cubic root of 2128889 is about 128.6424608669.

The spelling of 2128889 in words is "two million, one hundred twenty-eight thousand, eight hundred eighty-nine".