199787907 has 16 divisors (see below), whose sum is σ = 305896320. Its totient is φ = 114710400.

The previous prime is 199787881. The next prime is 199787941. The reversal of 199787907 is 709787991.

It is not a de Polignac number, because 199787907 - 2¹⁰ = 199786883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (199787977) 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 in 15 ways as a sum of consecutive naturals, for example, 158694 + ... + 159947.

It is an arithmetic number, because the mean of its divisors is an integer number (19118520).

Almost surely, 2^199787907 is an apocalyptic number.

199787907 is a deficient number, since it is larger than the sum of its proper divisors (106108413).

199787907 is a wasteful number, since it uses less digits than its factorization.

199787907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318674.

The product of its (nonzero) digits is 2000376, while the sum is 57.

The square root of 199787907 is about 14134.6350147430. The cubic root of 199787907 is about 584.5967532946.

The spelling of 199787907 in words is "one hundred ninety-nine million, seven hundred eighty-seven thousand, nine hundred seven".