199396189 has 4 divisors (see below), whose sum is σ = 199432224. Its totient is φ = 199360156.

The previous prime is 199396181. The next prime is 199396201. The reversal of 199396189 is 981693991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 981693991 = 10253 ⋅95747.

It is a cyclic number.

It is not a de Polignac number, because 199396189 - 2³ = 199396181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199396181) 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, 7777 + ... + 21430.

It is an arithmetic number, because the mean of its divisors is an integer number (49858056).

Almost surely, 2^199396189 is an apocalyptic number.

It is an amenable number.

199396189 is a deficient number, since it is larger than the sum of its proper divisors (36035).

199396189 is an equidigital number, since it uses as much as digits as its factorization.

199396189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36034.

The product of its digits is 944784, while the sum is 55.

The square root of 199396189 is about 14120.7715440765. The cubic root of 199396189 is about 584.2144363663.

The spelling of 199396189 in words is "one hundred ninety-nine million, three hundred ninety-six thousand, one hundred eighty-nine".