199681888 has 48 divisors (see below), whose sum is σ = 450261504. Its totient is φ = 85392000.

The previous prime is 199681879. The next prime is 199681921. The reversal of 199681888 is 888186991.

It is a congruent number.

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, 167631 + ... + 168817.

It is an arithmetic number, because the mean of its divisors is an integer number (9380448).

Almost surely, 2^199681888 is an apocalyptic number.

It is an amenable number.

199681888 is an abundant number, since it is smaller than the sum of its proper divisors (250579616).

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

199681888 is a wasteful number, since it uses less digits than its factorization.

199681888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955 (or 1947 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 58.

The square root of 199681888 is about 14130.8841903117. The cubic root of 199681888 is about 584.4933280665.

The spelling of 199681888 in words is "one hundred ninety-nine million, six hundred eighty-one thousand, eight hundred eighty-eight".