199999086 has 72 divisors (see below), whose sum is σ = 475592040. Its totient is φ = 55901664.

The previous prime is 199999081. The next prime is 199999091. The reversal of 199999086 is 680999991.

It is an interprime number because it is at equal distance from previous prime (199999081) and next prime (199999091).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999081) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1834800 + ... + 1834908.

It is an arithmetic number, because the mean of its divisors is an integer number (6605445).

Almost surely, 2^199999086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199999086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237796020).

199999086 is an abundant number, since it is smaller than the sum of its proper divisors (275592954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199999086 is a wasteful number, since it uses less digits than its factorization.

199999086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 2834352, while the sum is 60.

The square root of 199999086 is about 14142.1033089141. The cubic root of 199999086 is about 584.8026567905.

The spelling of 199999086 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, eighty-six".