394222909 has 2 divisors, whose sum is σ = 394222910. Its totient is φ = 394222908.

The previous prime is 394222903. The next prime is 394222943. The reversal of 394222909 is 909222493.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393228900 + 994009 = 19830^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 394222909 - 2²³ = 385834301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394222903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197111454 + 197111455.

It is an arithmetic number, because the mean of its divisors is an integer number (197111455).

Almost surely, 2^394222909 is an apocalyptic number.

It is an amenable number.

394222909 is a deficient number, since it is larger than the sum of its proper divisors (1).

394222909 is an equidigital number, since it uses as much as digits as its factorization.

394222909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 394222909 is about 19855.0474439121. The cubic root of 394222909 is about 733.2419202629.

The spelling of 394222909 in words is "three hundred ninety-four million, two hundred twenty-two thousand, nine hundred nine".