199890168 has 32 divisors (see below), whose sum is σ = 507921360. Its totient is φ = 65537280.

The previous prime is 199890137. The next prime is 199890179. The reversal of 199890168 is 861098991.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 199890168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66805 + ... + 69732.

Almost surely, 2^199890168 is an apocalyptic number.

It is an amenable number.

199890168 is an abundant number, since it is smaller than the sum of its proper divisors (308031192).

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

199890168 is a wasteful number, since it uses less digits than its factorization.

199890168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136607 (or 136603 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 199890168 is about 14138.2519428676. The cubic root of 199890168 is about 584.6964778019.

The spelling of 199890168 in words is "one hundred ninety-nine million, eight hundred ninety thousand, one hundred sixty-eight".