199448309 has 4 divisors (see below), whose sum is σ = 201278220. Its totient is φ = 197618400.

The previous prime is 199448297. The next prime is 199448311. The reversal of 199448309 is 903844991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 173976100 + 25472209 = 13190^2 + 5047^2 .

It is a cyclic number.

It is not a de Polignac number, because 199448309 - 2¹⁶ = 199382773 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199448209) 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, 914792 + ... + 915009.

It is an arithmetic number, because the mean of its divisors is an integer number (50319555).

Almost surely, 2^199448309 is an apocalyptic number.

It is an amenable number.

199448309 is a deficient number, since it is larger than the sum of its proper divisors (1829911).

199448309 is a wasteful number, since it uses less digits than its factorization.

199448309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829910.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 199448309 is about 14122.6169317163. The cubic root of 199448309 is about 584.2653343698.

The spelling of 199448309 in words is "one hundred ninety-nine million, four hundred forty-eight thousand, three hundred nine".