199985019 has 16 divisors (see below), whose sum is σ = 288110592. Its totient is φ = 122659488.

The previous prime is 199985011. The next prime is 199985021. The reversal of 199985019 is 910589991.

It is not a de Polignac number, because 199985019 - 2³ = 199985011 is a prime.

It is a super-2 number, since 2×199985019² = 79988015648860722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199985011) by changing a digit.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3622 + ... + 20324.

It is an arithmetic number, because the mean of its divisors is an integer number (18006912).

Almost surely, 2^199985019 is an apocalyptic number.

199985019 is a deficient number, since it is larger than the sum of its proper divisors (88125573).

199985019 is a wasteful number, since it uses less digits than its factorization.

199985019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17026.

The product of its (nonzero) digits is 262440, while the sum is 51.

The square root of 199985019 is about 14141.6059554776. The cubic root of 199985019 is about 584.7889457081.

The spelling of 199985019 in words is "one hundred ninety-nine million, nine hundred eighty-five thousand, nineteen".