2804209 has 2 divisors, whose sum is σ = 2804210. Its totient is φ = 2804208.

The previous prime is 2804203. The next prime is 2804227. The reversal of 2804209 is 9024082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1587600 + 1216609 = 1260^2 + 1103^2 .

It is a cyclic number.

It is not a de Polignac number, because 2804209 - 2¹⁷ = 2673137 is a prime.

It is not a weakly prime, because it can be changed into another prime (2804203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1402104 + 1402105.

It is an arithmetic number, because the mean of its divisors is an integer number (1402105).

2^2804209 is an apocalyptic number.

It is an amenable number.

2804209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2804209 is an equidigital number, since it uses as much as digits as its factorization.

2804209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2804209 is about 1674.5772600869. The cubic root of 2804209 is about 141.0165632840.

It can be divided in two parts, 280 and 4209, that added together give a square (4489 = 67²).

The spelling of 2804209 in words is "two million, eight hundred four thousand, two hundred nine".