199917808 has 30 divisors (see below), whose sum is σ = 398135976. Its totient is φ = 97246656.

The previous prime is 199917803. The next prime is 199917847. The reversal of 199917808 is 808719991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199917803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17341 + ... + 26467.

Almost surely, 2^199917808 is an apocalyptic number.

It is an amenable number.

199917808 is a deficient number, since it is larger than the sum of its proper divisors (198218168).

199917808 is an equidigital number, since it uses as much as digits as its factorization.

199917808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9209 (or 9166 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 52.

The square root of 199917808 is about 14139.2293990868. The cubic root of 199917808 is about 584.7234263774.

The spelling of 199917808 in words is "one hundred ninety-nine million, nine hundred seventeen thousand, eight hundred eight".