199999873 has 4 divisors (see below), whose sum is σ = 200226240. Its totient is φ = 199773508.

The previous prime is 199999853. The next prime is 199999889. The reversal of 199999873 is 378999991.

199999873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 378999991 = 37 ⋅10243243.

It is a cyclic number.

It is not a de Polignac number, because 199999873 - 2⁵ = 199999841 is a prime.

It is a super-2 number, since 2×199999873² = 79999898400032258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199999853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111853 + ... + 113626.

It is an arithmetic number, because the mean of its divisors is an integer number (50056560).

Almost surely, 2^199999873 is an apocalyptic number.

It is an amenable number.

199999873 is a deficient number, since it is larger than the sum of its proper divisors (226367).

199999873 is an equidigital number, since it uses as much as digits as its factorization.

199999873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226366.

The product of its digits is 9920232, while the sum is 64.

The square root of 199999873 is about 14142.1311336022. The cubic root of 199999873 is about 584.8034238591.

The spelling of 199999873 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred seventy-three".