199968443 has 2 divisors, whose sum is σ = 199968444.
Its totient is φ = 199968442.
The previous prime is 199968403. The next prime is 199968469. The reversal of 199968443 is 344869991.
It is a strong prime.
It is an emirp because it is prime and its reverse (344869991) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 199968443 - 214 = 199952059 is a prime.
It is not a weakly prime, because it can be changed into another prime (199968403) by changing a digit.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99984221 + 99984222.
It is an arithmetic number, because the mean of its divisors is an integer number (99984222).
Almost surely, 2199968443 is an apocalyptic number.
199968443 is a deficient number, since it is larger than the sum of its proper divisors (1).
199968443 is an equidigital number, since it uses as much as digits as its factorization.
199968443 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1679616, while the sum is 53.
The square root of 199968443 is about 14141.0198712823.
The cubic root of 199968443 is about 584.7727882821.
The spelling of 199968443 in words is "one hundred ninety-nine million, nine hundred sixty-eight thousand, four hundred forty-three".