199021728 has 24 divisors (see below), whose sum is σ = 522432288. Its totient is φ = 66340544.

The previous prime is 199021721. The next prime is 199021807. The reversal of 199021728 is 827120991.

199021728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×199021728² = 79219296432211968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199021721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1036476 + ... + 1036667.

It is an arithmetic number, because the mean of its divisors is an integer number (21768012).

Almost surely, 2^199021728 is an apocalyptic number.

It is an amenable number.

199021728 is an abundant number, since it is smaller than the sum of its proper divisors (323410560).

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

199021728 is a wasteful number, since it uses less digits than its factorization.

199021728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073156 (or 2073148 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 199021728 is about 14107.5060871864. The cubic root of 199021728 is about 583.8484938816.

The spelling of 199021728 in words is "one hundred ninety-nine million, twenty-one thousand, seven hundred twenty-eight".