2128805 has 12 divisors (see below), whose sum is σ = 2971980. Its totient is φ = 1459584.

The previous prime is 2128799. The next prime is 2128823. The reversal of 2128805 is 5088212.

2128805 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 2 ways, for example, as 1399489 + 729316 = 1183^2 + 854^2 .

It is not a de Polignac number, because 2128805 - 2⁸ = 2128549 is a prime.

It is a Curzon number.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 4100 + ... + 4589.

It is an arithmetic number, because the mean of its divisors is an integer number (247665).

2^2128805 is an apocalyptic number.

It is an amenable number.

2128805 is a deficient number, since it is larger than the sum of its proper divisors (843175).

2128805 is an equidigital number, since it uses as much as digits as its factorization.

2128805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8708 (or 8701 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 2128805 is about 1459.0424942407. The cubic root of 2128805 is about 128.6407688875.

The spelling of 2128805 in words is "two million, one hundred twenty-eight thousand, eight hundred five".