199391808 has 112 divisors (see below), whose sum is σ = 657782784. Its totient is φ = 51786240.

The previous prime is 199391789. The next prime is 199391851. The reversal of 199391808 is 808193991.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8041 + ... + 21527.

Almost surely, 2^199391808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199391808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328891392).

199391808 is an abundant number, since it is smaller than the sum of its proper divisors (458390976).

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

199391808 is a wasteful number, since it uses less digits than its factorization.

199391808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13520 (or 13510 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 48.

The square root of 199391808 is about 14120.6164171399. The cubic root of 199391808 is about 584.2101576784.

The spelling of 199391808 in words is "one hundred ninety-nine million, three hundred ninety-one thousand, eight hundred eight".