199149923 has 4 divisors (see below), whose sum is σ = 227599920. Its totient is φ = 170699928.

The previous prime is 199149919. The next prime is 199149941. The reversal of 199149923 is 329941991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329941991 = 1009 ⋅326999.

It is not a de Polignac number, because 199149923 - 2² = 199149919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199149943) 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, 14224988 + ... + 14225001.

It is an arithmetic number, because the mean of its divisors is an integer number (56899980).

Almost surely, 2^199149923 is an apocalyptic number.

199149923 is a deficient number, since it is larger than the sum of its proper divisors (28449997).

199149923 is an equidigital number, since it uses as much as digits as its factorization.

199149923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28449996.

The product of its digits is 157464, while the sum is 47.

The square root of 199149923 is about 14112.0488590424. The cubic root of 199149923 is about 583.9738242396.

The spelling of 199149923 in words is "one hundred ninety-nine million, one hundred forty-nine thousand, nine hundred twenty-three".