199493945 has 32 divisors (see below), whose sum is σ = 282528000. Its totient is φ = 135155328.

The previous prime is 199493941. The next prime is 199493951. The reversal of 199493945 is 549394991.

It is a happy number.

It is not a de Polignac number, because 199493945 - 2² = 199493941 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199493941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 151982 + ... + 153288.

It is an arithmetic number, because the mean of its divisors is an integer number (8829000).

Almost surely, 2^199493945 is an apocalyptic number.

It is an amenable number.

199493945 is a deficient number, since it is larger than the sum of its proper divisors (83034055).

199493945 is an equidigital number, since it uses as much as digits as its factorization.

199493945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422 (or 1408 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 53.

The square root of 199493945 is about 14124.2325455226. The cubic root of 199493945 is about 584.3098931154.

The spelling of 199493945 in words is "one hundred ninety-nine million, four hundred ninety-three thousand, nine hundred forty-five".