199440317 has 4 divisors (see below), whose sum is σ = 203683776. Its totient is φ = 195196860.

The previous prime is 199440313. The next prime is 199440361. The reversal of 199440317 is 713044991.

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: 713044991 = 17 ⋅41943823.

It is a cyclic number.

It is not a de Polignac number, because 199440317 - 2² = 199440313 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 (199440313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2121659 + ... + 2121752.

It is an arithmetic number, because the mean of its divisors is an integer number (50920944).

Almost surely, 2^199440317 is an apocalyptic number.

It is an amenable number.

199440317 is a deficient number, since it is larger than the sum of its proper divisors (4243459).

199440317 is an equidigital number, since it uses as much as digits as its factorization.

199440317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4243458.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 199440317 is about 14122.3339784895. Note that the first 3 decimals coincide. The cubic root of 199440317 is about 584.2575303245.

The spelling of 199440317 in words is "one hundred ninety-nine million, four hundred forty thousand, three hundred seventeen".