394997693 has 2 divisors, whose sum is σ = 394997694. Its totient is φ = 394997692.

The previous prime is 394997683. The next prime is 394997723. The reversal of 394997693 is 396799493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331349209 + 63648484 = 18203^2 + 7978^2 .

It is an emirp because it is prime and its reverse (396799493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394997693 - 2⁸ = 394997437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394997623) 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, 197498846 + 197498847.

It is an arithmetic number, because the mean of its divisors is an integer number (197498847).

Almost surely, 2^394997693 is an apocalyptic number.

It is an amenable number.

394997693 is a deficient number, since it is larger than the sum of its proper divisors (1).

394997693 is an equidigital number, since it uses as much as digits as its factorization.

394997693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9920232, while the sum is 59.

The square root of 394997693 is about 19874.5488753833. The cubic root of 394997693 is about 733.7219636828.

The spelling of 394997693 in words is "three hundred ninety-four million, nine hundred ninety-seven thousand, six hundred ninety-three".