199857988 has 24 divisors (see below), whose sum is σ = 381929184. Its totient is φ = 90753600.

The previous prime is 199857949. The next prime is 199857989. The reversal of 199857988 is 889758991.

It is not an unprimeable number, because it can be changed into a prime (199857989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63631 + ... + 66697.

It is an arithmetic number, because the mean of its divisors is an integer number (15913716).

Almost surely, 2^199857988 is an apocalyptic number.

It is an amenable number.

199857988 is a deficient number, since it is larger than the sum of its proper divisors (182071196).

199857988 is a wasteful number, since it uses less digits than its factorization.

199857988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4563 (or 4561 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 64.

The square root of 199857988 is about 14137.1138497219. The cubic root of 199857988 is about 584.6650996663.

The spelling of 199857988 in words is "one hundred ninety-nine million, eight hundred fifty-seven thousand, nine hundred eighty-eight".