2800009 has 4 divisors (see below), whose sum is σ = 2806020. Its totient is φ = 2794000.

The previous prime is 2800003. The next prime is 2800033. The reversal of 2800009 is 9000082.

2800009 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.

It can be written as a sum of positive squares in 2 ways, for example, as 2569609 + 230400 = 1603^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2800009 - 2³ = 2800001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2800001) 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, 2242 + ... + 3259.

It is an arithmetic number, because the mean of its divisors is an integer number (701505).

2^2800009 is an apocalyptic number.

It is an amenable number.

2800009 is a deficient number, since it is larger than the sum of its proper divisors (6011).

2800009 is an equidigital number, since it uses as much as digits as its factorization.

2800009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6010.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 2800009 is about 1673.3227423304. The cubic root of 2800009 is about 140.9461256547.

The spelling of 2800009 in words is "two million, eight hundred thousand, nine".