4394209 has 2 divisors, whose sum is σ = 4394210. Its totient is φ = 4394208.

The previous prime is 4394191. The next prime is 4394227. The reversal of 4394209 is 9024934.

It is a balanced prime because it is at equal distance from previous prime (4394191) and next prime (4394227).

It can be written as a sum of positive squares in only one way, i.e., 4389025 + 5184 = 2095^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 4394209 - 2¹⁷ = 4263137 is a prime.

4394209 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (4394249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2197104 + 2197105.

It is an arithmetic number, because the mean of its divisors is an integer number (2197105).

Almost surely, 2^4394209 is an apocalyptic number.

It is an amenable number.

4394209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4394209 is an equidigital number, since it uses as much as digits as its factorization.

4394209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 4394209 is about 2096.2368663870. The cubic root of 4394209 is about 163.7923333239.

The spelling of 4394209 in words is "four million, three hundred ninety-four thousand, two hundred nine".