199438807 has 2 divisors, whose sum is σ = 199438808. Its totient is φ = 199438806.

The previous prime is 199438793. The next prime is 199438861. The reversal of 199438807 is 708834991.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (708834991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199438807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199438867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99719403 + 99719404.

It is an arithmetic number, because the mean of its divisors is an integer number (99719404).

Almost surely, 2^199438807 is an apocalyptic number.

199438807 is a deficient number, since it is larger than the sum of its proper divisors (1).

199438807 is an equidigital number, since it uses as much as digits as its factorization.

199438807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 199438807 is about 14122.2805169703. The cubic root of 199438807 is about 584.2560558130.

The spelling of 199438807 in words is "one hundred ninety-nine million, four hundred thirty-eight thousand, eight hundred seven".