2808009 has 12 divisors (see below), whose sum is σ = 4294836. Its totient is φ = 1761792.

The previous prime is 2808007. The next prime is 2808017. The reversal of 2808009 is 9008082.

2808009 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 944784 + 1863225 = 972^2 + 1365^2 .

It is not a de Polignac number, because 2808009 - 2¹ = 2808007 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2808007) 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 11 ways as a sum of consecutive naturals, for example, 9024 + ... + 9329.

It is an arithmetic number, because the mean of its divisors is an integer number (357903).

2^2808009 is an apocalyptic number.

It is an amenable number.

2808009 is a deficient number, since it is larger than the sum of its proper divisors (1486827).

2808009 is a wasteful number, since it uses less digits than its factorization.

2808009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18376 (or 18373 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 2808009 is about 1675.7114906809. The cubic root of 2808009 is about 141.0802319897.

The spelling of 2808009 in words is "two million, eight hundred eight thousand, nine".