199878199 has 2 divisors, whose sum is σ = 199878200. Its totient is φ = 199878198.

The previous prime is 199878191. The next prime is 199878209. The reversal of 199878199 is 991878991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199878199 - 2³ = 199878191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199878191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99939099 + 99939100.

It is an arithmetic number, because the mean of its divisors is an integer number (99939100).

Almost surely, 2^199878199 is an apocalyptic number.

199878199 is a deficient number, since it is larger than the sum of its proper divisors (1).

199878199 is an equidigital number, since it uses as much as digits as its factorization.

199878199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 61.

The square root of 199878199 is about 14137.8286522365. The cubic root of 199878199 is about 584.6848074400.

The spelling of 199878199 in words is "one hundred ninety-nine million, eight hundred seventy-eight thousand, one hundred ninety-nine".