199993668 has 24 divisors (see below), whose sum is σ = 533316672. Its totient is φ = 57141024.

The previous prime is 199993667. The next prime is 199993669. The reversal of 199993668 is 866399991.

It is an interprime number because it is at equal distance from previous prime (199993667) and next prime (199993669).

It is not an unprimeable number, because it can be changed into a prime (199993663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1190355 + ... + 1190522.

It is an arithmetic number, because the mean of its divisors is an integer number (22221528).

Almost surely, 2^199993668 is an apocalyptic number.

It is an amenable number.

199993668 is an abundant number, since it is smaller than the sum of its proper divisors (333323004).

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

199993668 is a wasteful number, since it uses less digits than its factorization.

199993668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380891 (or 2380889 counting only the distinct ones).

The product of its digits is 5668704, while the sum is 60.

The square root of 199993668 is about 14141.9117519521. The cubic root of 199993668 is about 584.7973759507.

It can be divided in two parts, 199993 and 668, that added together give a triangular number (200661 = T₆₃₃).

The spelling of 199993668 in words is "one hundred ninety-nine million, nine hundred ninety-three thousand, six hundred sixty-eight".