199193889 has 4 divisors (see below), whose sum is σ = 265591856. Its totient is φ = 132795924.

The previous prime is 199193809. The next prime is 199193899. The reversal of 199193889 is 988391991.

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.

It is not a de Polignac number, because 199193889 - 2⁸ = 199193633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199193809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33198979 + ... + 33198984.

It is an arithmetic number, because the mean of its divisors is an integer number (66397964).

Almost surely, 2^199193889 is an apocalyptic number.

It is an amenable number.

199193889 is a deficient number, since it is larger than the sum of its proper divisors (66397967).

199193889 is an equidigital number, since it uses as much as digits as its factorization.

199193889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66397966.

The product of its digits is 1259712, while the sum is 57.

The square root of 199193889 is about 14113.6065199509. The cubic root of 199193889 is about 584.0167953902.

The spelling of 199193889 in words is "one hundred ninety-nine million, one hundred ninety-three thousand, eight hundred eighty-nine".