199997508 has 24 divisors (see below), whose sum is σ = 478044000. Its totient is φ = 65039680.

The previous prime is 199997491. The next prime is 199997513. The reversal of 199997508 is 805799991.

199997508 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 202758 + ... + 203741.

It is an arithmetic number, because the mean of its divisors is an integer number (19918500).

Almost surely, 2^199997508 is an apocalyptic number.

It is an amenable number.

199997508 is an abundant number, since it is smaller than the sum of its proper divisors (278046492).

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

199997508 is a wasteful number, since it uses less digits than its factorization.

199997508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406547 (or 406545 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 57.

The square root of 199997508 is about 14142.0475179516. The cubic root of 199997508 is about 584.8011187484.

The spelling of 199997508 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, five hundred eight".