199639252 has 6 divisors (see below), whose sum is σ = 349368698. Its totient is φ = 99819624.

The previous prime is 199639183. The next prime is 199639259. The reversal of 199639252 is 252936991.

It can be written as a sum of positive squares in only one way, i.e., 176464656 + 23174596 = 13284^2 + 4814^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199639259) 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 as a sum of consecutive naturals, namely, 24954903 + ... + 24954910.

Almost surely, 2^199639252 is an apocalyptic number.

It is an amenable number.

199639252 is a deficient number, since it is larger than the sum of its proper divisors (149729446).

199639252 is a wasteful number, since it uses less digits than its factorization.

199639252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49909817 (or 49909815 counting only the distinct ones).

The product of its digits is 262440, while the sum is 46.

The square root of 199639252 is about 14129.3754992922. The cubic root of 199639252 is about 584.4517248417.

The spelling of 199639252 in words is "one hundred ninety-nine million, six hundred thirty-nine thousand, two hundred fifty-two".