199850765 has 12 divisors (see below), whose sum is σ = 241557372. Its totient is φ = 158731200.

The previous prime is 199850753. The next prime is 199850767. The reversal of 199850765 is 567058991.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31214569 + 168636196 = 5587^2 + 12986^2 .

It is not a de Polignac number, because 199850765 - 2²⁰ = 198802189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199850767) 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 in 11 ways as a sum of consecutive naturals, for example, 113129 + ... + 114881.

It is an arithmetic number, because the mean of its divisors is an integer number (20129781).

Almost surely, 2^199850765 is an apocalyptic number.

It is an amenable number.

199850765 is a deficient number, since it is larger than the sum of its proper divisors (41706607).

199850765 is an equidigital number, since it uses as much as digits as its factorization.

199850765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060 (or 1909 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 50.

The square root of 199850765 is about 14136.8583850868. The cubic root of 199850765 is about 584.6580561868.

The spelling of 199850765 in words is "one hundred ninety-nine million, eight hundred fifty thousand, seven hundred sixty-five".