199428 has 12 divisors (see below), whose sum is σ = 465360. Its totient is φ = 66472.

The previous prime is 199417. The next prime is 199429. The reversal of 199428 is 824991.

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (199429) 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, 8298 + ... + 8321.

It is an arithmetic number, because the mean of its divisors is an integer number (38780).

2¹⁹⁹⁴²⁸ is an apocalyptic number.

It is an amenable number.

199428 is an abundant number, since it is smaller than the sum of its proper divisors (265932).

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

199428 is a wasteful number, since it uses less digits than its factorization.

199428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16626 (or 16624 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 199428 is about 446.5736221498. The cubic root of 199428 is about 58.4245502586.

The spelling of 199428 in words is "one hundred ninety-nine thousand, four hundred twenty-eight".