199724391889 has 48 divisors (see below), whose sum is σ = 229595742208. Its totient is φ = 173413548000.

The previous prime is 199724391833. The next prime is 199724391901. The reversal of 199724391889 is 988193427991.

It is a de Polignac number, because none of the positive numbers 2^k-199724391889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199724391809) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100514554 + ... + 100516540.

Almost surely, 2^199724391889 is an apocalyptic number.

It is an amenable number.

199724391889 is a deficient number, since it is larger than the sum of its proper divisors (29871350319).

199724391889 is a wasteful number, since it uses less digits than its factorization.

199724391889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378 (or 2367 counting only the distinct ones).

The product of its digits is 70543872, while the sum is 70.

The spelling of 199724391889 in words is "one hundred ninety-nine billion, seven hundred twenty-four million, three hundred ninety-one thousand, eight hundred eighty-nine".