199989888 has 128 divisors (see below), whose sum is σ = 620421120. Its totient is φ = 55888896.

The previous prime is 199989883. The next prime is 199989893. The reversal of 199989888 is 888989991.

199989888 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (199989883) and next prime (199989893).

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199989883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125545 + ... + 127127.

It is an arithmetic number, because the mean of its divisors is an integer number (4847040).

Almost surely, 2^199989888 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 199989888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310210560).

199989888 is an abundant number, since it is smaller than the sum of its proper divisors (420431232).

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

199989888 is a wasteful number, since it uses less digits than its factorization.

199989888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654 (or 1642 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 69.

The square root of 199989888 is about 14141.7781060233. The cubic root of 199989888 is about 584.7936915873.

The spelling of 199989888 in words is "one hundred ninety-nine million, nine hundred eighty-nine thousand, eight hundred eighty-eight".