2805009 has 4 divisors (see below), whose sum is σ = 3740016. Its totient is φ = 1870004.

The previous prime is 2805001. The next prime is 2805031. The reversal of 2805009 is 9005082.

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 2805009 - 2³ = 2805001 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 2805009.

It is not an unprimeable number, because it can be changed into a prime (2805001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467499 + ... + 467504.

It is an arithmetic number, because the mean of its divisors is an integer number (935004).

2^2805009 is an apocalyptic number.

It is an amenable number.

2805009 is a deficient number, since it is larger than the sum of its proper divisors (935007).

2805009 is an equidigital number, since it uses as much as digits as its factorization.

2805009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935006.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 2805009 is about 1674.8161093087. The cubic root of 2805009 is about 141.0299719998.

The spelling of 2805009 in words is "two million, eight hundred five thousand, nine".