199328709 has 4 divisors (see below), whose sum is σ = 265771616. Its totient is φ = 132885804.

The previous prime is 199328581. The next prime is 199328711. The reversal of 199328709 is 907823991.

199328709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 907823991 = 3 ⋅302607997.

It is not a de Polignac number, because 199328709 - 2⁷ = 199328581 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199328719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33221449 + ... + 33221454.

It is an arithmetic number, because the mean of its divisors is an integer number (66442904).

Almost surely, 2^199328709 is an apocalyptic number.

It is an amenable number.

199328709 is a deficient number, since it is larger than the sum of its proper divisors (66442907).

199328709 is an equidigital number, since it uses as much as digits as its factorization.

199328709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66442906.

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 199328709 is about 14118.3819540343. The cubic root of 199328709 is about 584.1485253135.

The spelling of 199328709 in words is "one hundred ninety-nine million, three hundred twenty-eight thousand, seven hundred nine".