199820965 has 16 divisors (see below), whose sum is σ = 242274672. Its totient is φ = 158206464.

The previous prime is 199820917. The next prime is 199820983. The reversal of 199820965 is 569028991.

199820965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 9132484 + 190688481 = 3022^2 + 13809^2 .

It is a cyclic number.

It is not a de Polignac number, because 199820965 - 2²³ = 191432357 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 15 ways as a sum of consecutive naturals, for example, 358467 + ... + 359023.

It is an arithmetic number, because the mean of its divisors is an integer number (15142167).

Almost surely, 2^199820965 is an apocalyptic number.

It is an amenable number.

199820965 is a deficient number, since it is larger than the sum of its proper divisors (42453707).

199820965 is a wasteful number, since it uses less digits than its factorization.

199820965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 199820965 is about 14135.8043633887. The cubic root of 199820965 is about 584.6289950419.

The spelling of 199820965 in words is "one hundred ninety-nine million, eight hundred twenty thousand, nine hundred sixty-five".