394853309 has 2 divisors, whose sum is σ = 394853310. Its totient is φ = 394853308.

The previous prime is 394853267. The next prime is 394853321. The reversal of 394853309 is 903358493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354568900 + 40284409 = 18830^2 + 6347^2 .

It is a cyclic number.

It is not a de Polignac number, because 394853309 - 2²⁸ = 126417853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394853309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394853359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197426654 + 197426655.

It is an arithmetic number, because the mean of its divisors is an integer number (197426655).

Almost surely, 2^394853309 is an apocalyptic number.

It is an amenable number.

394853309 is a deficient number, since it is larger than the sum of its proper divisors (1).

394853309 is an equidigital number, since it uses as much as digits as its factorization.

394853309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 394853309 is about 19870.9161590501. The cubic root of 394853309 is about 733.6325533526.

The spelling of 394853309 in words is "three hundred ninety-four million, eight hundred fifty-three thousand, three hundred nine".