199999994 has 8 divisors (see below), whose sum is σ = 300235188. Its totient is φ = 99921600.

The previous prime is 199999991. The next prime is 200000033. The reversal of 199999994 is 499999991.

It can be written as a sum of positive squares in 2 ways, for example, as 137194369 + 62805625 = 11713^2 + 7925^2 .

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 (199999991) 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, 35957 + ... + 41144.

Almost surely, 2^199999994 is an apocalyptic number.

199999994 is a deficient number, since it is larger than the sum of its proper divisors (100235194).

199999994 is a wasteful number, since it uses less digits than its factorization.

199999994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78400.

The product of its digits is 19131876, while the sum is 68.

The square root of 199999994 is about 14142.1354115989. The cubic root of 199999994 is about 584.8035417945.

The spelling of 199999994 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-four".