4243009 has 2 divisors, whose sum is σ = 4243010. Its totient is φ = 4243008.

The previous prime is 4243003. The next prime is 4243039. The reversal of 4243009 is 9003424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3186225 + 1056784 = 1785^2 + 1028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4243009 is a prime.

It is not a weakly prime, because it can be changed into another prime (4243003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121504 + 2121505.

It is an arithmetic number, because the mean of its divisors is an integer number (2121505).

Almost surely, 2^4243009 is an apocalyptic number.

It is an amenable number.

4243009 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243009 is an equidigital number, since it uses as much as digits as its factorization.

4243009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 4243009 is about 2059.8565484033. The cubic root of 4243009 is about 161.8917251394.

The spelling of 4243009 in words is "four million, two hundred forty-three thousand, nine".