199999930 has 16 divisors (see below), whose sum is σ = 387692424. Its totient is φ = 73846080.

The previous prime is 199999903. The next prime is 199999931. The reversal of 199999930 is 39999991.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 153091129 + 46908801 = 12373^2 + 6849^2 .

It is not an unprimeable number, because it can be changed into a prime (199999931) 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, 769101 + ... + 769360.

Almost surely, 2^199999930 is an apocalyptic number.

199999930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199999930 is a deficient number, since it is larger than the sum of its proper divisors (187692494).

199999930 is a wasteful number, since it uses less digits than its factorization.

199999930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538481.

The product of its (nonzero) digits is 1594323, while the sum is 58.

The square root of 199999930 is about 14142.1331488570. The cubic root of 199999930 is about 584.8034794155.

It can be divided in two parts, 19999 and 9930, that added together give a square (29929 = 173²).

The spelling of 199999930 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred thirty".