199863893 has 2 divisors, whose sum is σ = 199863894. Its totient is φ = 199863892.

The previous prime is 199863863. The next prime is 199863943. The reversal of 199863893 is 398368991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122036209 + 77827684 = 11047^2 + 8822^2 .

It is a cyclic number.

It is not a de Polignac number, because 199863893 - 2⁸ = 199863637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199863803) 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, 99931946 + 99931947.

It is an arithmetic number, because the mean of its divisors is an integer number (99931947).

Almost surely, 2^199863893 is an apocalyptic number.

It is an amenable number.

199863893 is a deficient number, since it is larger than the sum of its proper divisors (1).

199863893 is an equidigital number, since it uses as much as digits as its factorization.

199863893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 56.

The square root of 199863893 is about 14137.3226956167. The cubic root of 199863893 is about 584.6708577772.

The spelling of 199863893 in words is "one hundred ninety-nine million, eight hundred sixty-three thousand, eight hundred ninety-three".