199999000 has 32 divisors (see below), whose sum is σ = 468000000. Its totient is φ = 79999200.

The previous prime is 199998989. The next prime is 199999001. The reversal of 199999000 is 999991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99000 + ... + 100999.

It is an arithmetic number, because the mean of its divisors is an integer number (14625000).

Almost surely, 2^199999000 is an apocalyptic number.

199999000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199999000 is an abundant number, since it is smaller than the sum of its proper divisors (268001000).

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

199999000 is a wasteful number, since it uses less digits than its factorization.

199999000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200020 (or 200006 counting only the distinct ones).

The product of its (nonzero) digits is 59049, while the sum is 46.

The square root of 199999000 is about 14142.1002683477. The cubic root of 199999000 is about 584.8025729684.

The spelling of 199999000 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand".