199923816 has 32 divisors (see below), whose sum is σ = 503632800. Its totient is φ = 66131520.

The previous prime is 199923793. The next prime is 199923821. The reversal of 199923816 is 618329991.

199923816 is digitally balanced in base 2, 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, 28651 + ... + 34938.

It is an arithmetic number, because the mean of its divisors is an integer number (15738525).

Almost surely, 2^199923816 is an apocalyptic number.

It is an amenable number.

199923816 is an abundant number, since it is smaller than the sum of its proper divisors (303708984).

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

199923816 is a wasteful number, since it uses less digits than its factorization.

199923816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63729 (or 63725 counting only the distinct ones).

The product of its digits is 209952, while the sum is 48.

The square root of 199923816 is about 14139.4418560281. The cubic root of 199923816 is about 584.7292837565.

The spelling of 199923816 in words is "one hundred ninety-nine million, nine hundred twenty-three thousand, eight hundred sixteen".