2804309 has 2 divisors, whose sum is σ = 2804310. Its totient is φ = 2804308.

The previous prime is 2804299. The next prime is 2804311. The reversal of 2804309 is 9034082.

2804309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1493284 + 1311025 = 1222^2 + 1145^2 .

It is a cyclic number.

It is not a de Polignac number, because 2804309 - 2⁴ = 2804293 is a prime.

Together with 2804311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2804209) 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 as a sum of consecutive naturals, namely, 1402154 + 1402155.

It is an arithmetic number, because the mean of its divisors is an integer number (1402155).

2^2804309 is an apocalyptic number.

It is an amenable number.

2804309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2804309 is an equidigital number, since it uses as much as digits as its factorization.

2804309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2804309 is about 1674.6071181026. The cubic root of 2804309 is about 141.0182395129.

It can be divided in two parts, 2804 and 309, that added together give a palindrome (3113).

The spelling of 2804309 in words is "two million, eight hundred four thousand, three hundred nine".