199967863 has 2 divisors, whose sum is σ = 199967864. Its totient is φ = 199967862.

The previous prime is 199967861. The next prime is 199967899. The reversal of 199967863 is 368769991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199967863 - 2¹ = 199967861 is a prime.

Together with 199967861, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 199967798 and 199967807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199967861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99983931 + 99983932.

It is an arithmetic number, because the mean of its divisors is an integer number (99983932).

Almost surely, 2^199967863 is an apocalyptic number.

199967863 is a deficient number, since it is larger than the sum of its proper divisors (1).

199967863 is an equidigital number, since it uses as much as digits as its factorization.

199967863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4408992, while the sum is 58.

The square root of 199967863 is about 14140.9993635528. Note that the first 3 decimals coincide. The cubic root of 199967863 is about 584.7722229120.

The spelling of 199967863 in words is "one hundred ninety-nine million, nine hundred sixty-seven thousand, eight hundred sixty-three".