199959605 has 4 divisors (see below), whose sum is σ = 239951532. Its totient is φ = 159967680.

The previous prime is 199959587. The next prime is 199959623. The reversal of 199959605 is 506959991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506959991 = 29 ⋅17481379.

It is an interprime number because it is at equal distance from previous prime (199959587) and next prime (199959623).

It can be written as a sum of positive squares in 2 ways, for example, as 39025009 + 160934596 = 6247^2 + 12686^2 .

It is not a de Polignac number, because 199959605 - 2⁶ = 199959541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19995956 + ... + 19995965.

It is an arithmetic number, because the mean of its divisors is an integer number (59987883).

Almost surely, 2^199959605 is an apocalyptic number.

It is an amenable number.

199959605 is a deficient number, since it is larger than the sum of its proper divisors (39991927).

199959605 is an equidigital number, since it uses as much as digits as its factorization.

199959605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39991926.

The product of its (nonzero) digits is 984150, while the sum is 53.

The square root of 199959605 is about 14140.7073726883. The cubic root of 199959605 is about 584.7641730927.

The spelling of 199959605 in words is "one hundred ninety-nine million, nine hundred fifty-nine thousand, six hundred five".