199907994 has 64 divisors (see below), whose sum is σ = 473131008. Its totient is φ = 55512000.

The previous prime is 199907977. The next prime is 199908011. The reversal of 199907994 is 499709991.

It is an interprime number because it is at equal distance from previous prime (199907977) and next prime (199908011).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128787 + ... + 130329.

It is an arithmetic number, because the mean of its divisors is an integer number (7392672).

Almost surely, 2^199907994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199907994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236565504).

199907994 is an abundant number, since it is smaller than the sum of its proper divisors (273223014).

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

199907994 is a wasteful number, since it uses less digits than its factorization.

199907994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723.

The product of its (nonzero) digits is 1653372, while the sum is 57.

The square root of 199907994 is about 14138.8823462111. The cubic root of 199907994 is about 584.7138581625.

The spelling of 199907994 in words is "one hundred ninety-nine million, nine hundred seven thousand, nine hundred ninety-four".