4065209 has 2 divisors, whose sum is σ = 4065210. Its totient is φ = 4065208.

The previous prime is 4065203. The next prime is 4065211. The reversal of 4065209 is 9025604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3168400 + 896809 = 1780^2 + 947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4065209 is a prime.

Together with 4065211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4065203) 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, 2032604 + 2032605.

It is an arithmetic number, because the mean of its divisors is an integer number (2032605).

Almost surely, 2^4065209 is an apocalyptic number.

It is an amenable number.

4065209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4065209 is an equidigital number, since it uses as much as digits as its factorization.

4065209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 4065209 is about 2016.2363452730. The cubic root of 4065209 is about 159.5980666763.

The spelling of 4065209 in words is "four million, sixty-five thousand, two hundred nine".