199888321 has 8 divisors (see below), whose sum is σ = 204376320. Its totient is φ = 195410208.

The previous prime is 199888307. The next prime is 199888327. The reversal of 199888321 is 123888991.

199888321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-199888321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199888327) 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, 51180 + ... + 54946.

It is an arithmetic number, because the mean of its divisors is an integer number (25547040).

Almost surely, 2^199888321 is an apocalyptic number.

It is an amenable number.

199888321 is a deficient number, since it is larger than the sum of its proper divisors (4487999).

199888321 is a wasteful number, since it uses less digits than its factorization.

199888321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4943.

The product of its digits is 248832, while the sum is 49.

The square root of 199888321 is about 14138.1866234677. The cubic root of 199888321 is about 584.6946769168.

The spelling of 199888321 in words is "one hundred ninety-nine million, eight hundred eighty-eight thousand, three hundred twenty-one".