199997393 has 2 divisors, whose sum is σ = 199997394. Its totient is φ = 199997392.

The previous prime is 199997389. The next prime is 199997407. The reversal of 199997393 is 393799991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190219264 + 9778129 = 13792^2 + 3127^2 .

It is a cyclic number.

It is not a de Polignac number, because 199997393 - 2² = 199997389 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (199997593) 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, 99998696 + 99998697.

It is an arithmetic number, because the mean of its divisors is an integer number (99998697).

Almost surely, 2^199997393 is an apocalyptic number.

It is an amenable number.

199997393 is a deficient number, since it is larger than the sum of its proper divisors (1).

199997393 is an equidigital number, since it uses as much as digits as its factorization.

199997393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3720087, while the sum is 59.

The square root of 199997393 is about 14142.0434520617. The cubic root of 199997393 is about 584.8010066601.

The spelling of 199997393 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, three hundred ninety-three".