199883987 has 2 divisors, whose sum is σ = 199883988. Its totient is φ = 199883986.

The previous prime is 199883951. The next prime is 199883989. The reversal of 199883987 is 789388991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199883987 - 2²⁰ = 198835411 is a prime.

Together with 199883989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199883989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99941993 + 99941994.

It is an arithmetic number, because the mean of its divisors is an integer number (99941994).

Almost surely, 2^199883987 is an apocalyptic number.

199883987 is a deficient number, since it is larger than the sum of its proper divisors (1).

199883987 is an equidigital number, since it uses as much as digits as its factorization.

199883987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 62.

The square root of 199883987 is about 14138.0333497980. The cubic root of 199883987 is about 584.6904510820.

The spelling of 199883987 in words is "one hundred ninety-nine million, eight hundred eighty-three thousand, nine hundred eighty-seven".