2809223 has 2 divisors, whose sum is σ = 2809224. Its totient is φ = 2809222.

The previous prime is 2809211. The next prime is 2809241. The reversal of 2809223 is 3229082.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2809223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2809192 and 2809201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2809253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1404611 + 1404612.

It is an arithmetic number, because the mean of its divisors is an integer number (1404612).

2^2809223 is an apocalyptic number.

2809223 is a deficient number, since it is larger than the sum of its proper divisors (1).

2809223 is an equidigital number, since it uses as much as digits as its factorization.

2809223 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 2809223 is about 1676.0736857310. The cubic root of 2809223 is about 141.1005603582.

The spelling of 2809223 in words is "two million, eight hundred nine thousand, two hundred twenty-three".