199199718 has 12 divisors (see below), whose sum is σ = 431599428. Its totient is φ = 66399900.

The previous prime is 199199701. The next prime is 199199719. The reversal of 199199718 is 817991991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199199719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5533308 + ... + 5533343.

It is an arithmetic number, because the mean of its divisors is an integer number (35966619).

Almost surely, 2^199199718 is an apocalyptic number.

199199718 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199199718 is an abundant number, since it is smaller than the sum of its proper divisors (232399710).

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

199199718 is a wasteful number, since it uses less digits than its factorization.

199199718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11066659 (or 11066656 counting only the distinct ones).

The product of its digits is 367416, while the sum is 54.

The square root of 199199718 is about 14113.8130212923. The cubic root of 199199718 is about 584.0224920186.

The spelling of 199199718 in words is "one hundred ninety-nine million, one hundred ninety-nine thousand, seven hundred eighteen".