199900618 has 8 divisors (see below), whose sum is σ = 300039012. Its totient is φ = 99887616.

The previous prime is 199900609. The next prime is 199900619. The reversal of 199900618 is 816009991.

It can be written as a sum of positive squares in 2 ways, for example, as 198894609 + 1006009 = 14103^2 + 1003^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (199900619) 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 3 ways as a sum of consecutive naturals, for example, 27255 + ... + 33802.

Almost surely, 2^199900618 is an apocalyptic number.

199900618 is a deficient number, since it is larger than the sum of its proper divisors (100138394).

199900618 is a wasteful number, since it uses less digits than its factorization.

199900618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62696.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 199900618 is about 14138.6215028199. The cubic root of 199900618 is about 584.7066666835.

The spelling of 199900618 in words is "one hundred ninety-nine million, nine hundred thousand, six hundred eighteen".