2808609 has 4 divisors (see below), whose sum is σ = 3744816. Its totient is φ = 1872404.

The previous prime is 2808607. The next prime is 2808647. The reversal of 2808609 is 9068082.

2808609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2808609 - 2¹ = 2808607 is a prime.

It is a D-number.

2808609 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2808609.

It is not an unprimeable number, because it can be changed into a prime (2808601) 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 3 ways as a sum of consecutive naturals, for example, 468099 + ... + 468104.

It is an arithmetic number, because the mean of its divisors is an integer number (936204).

2^2808609 is an apocalyptic number.

It is an amenable number.

2808609 is a deficient number, since it is larger than the sum of its proper divisors (936207).

2808609 is an equidigital number, since it uses as much as digits as its factorization.

2808609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936206.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 2808609 is about 1675.8905095501. The cubic root of 2808609 is about 141.0902796914.

The spelling of 2808609 in words is "two million, eight hundred eight thousand, six hundred nine".