199907 has 4 divisors (see below), whose sum is σ = 204600. Its totient is φ = 195216.

The previous prime is 199889. The next prime is 199909. The reversal of 199907 is 709991.

It is a happy number.

199907 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.

It is a cyclic number.

It is not a de Polignac number, because 199907 - 2¹⁴ = 183523 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (199909) 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, 2282 + ... + 2367.

It is an arithmetic number, because the mean of its divisors is an integer number (51150).

2¹⁹⁹⁹⁰⁷ is an apocalyptic number.

199907 is a deficient number, since it is larger than the sum of its proper divisors (4693).

199907 is an equidigital number, since it uses as much as digits as its factorization.

199907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4692.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 199907 is about 447.1096062488. The cubic root of 199907 is about 58.4712889039.

The spelling of 199907 in words is "one hundred ninety-nine thousand, nine hundred seven".