2208809 has 2 divisors, whose sum is σ = 2208810. Its totient is φ = 2208808.

The previous prime is 2208803. The next prime is 2208823. The reversal of 2208809 is 9088022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2166784 + 42025 = 1472^2 + 205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2208809 is a prime.

It is not a weakly prime, because it can be changed into another prime (2208803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1104404 + 1104405.

It is an arithmetic number, because the mean of its divisors is an integer number (1104405).

2^2208809 is an apocalyptic number.

It is an amenable number.

2208809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2208809 is an equidigital number, since it uses as much as digits as its factorization.

2208809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 2208809 is about 1486.2062440994. The cubic root of 2208809 is about 130.2325030560.

The spelling of 2208809 in words is "two million, two hundred eight thousand, eight hundred nine".