199997763 has 12 divisors (see below), whose sum is σ = 310200840. Its totient is φ = 114284352.

The previous prime is 199997761. The next prime is 199997767. The reversal of 199997763 is 367799991.

It is not a de Polignac number, because 199997763 - 2¹ = 199997761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199997697 and 199997706.

It is not an unprimeable number, because it can be changed into a prime (199997761) 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, 680118 + ... + 680411.

It is an arithmetic number, because the mean of its divisors is an integer number (25850070).

Almost surely, 2^199997763 is an apocalyptic number.

199997763 is a deficient number, since it is larger than the sum of its proper divisors (110203077).

199997763 is a wasteful number, since it uses less digits than its factorization.

199997763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360546 (or 1360539 counting only the distinct ones).

The product of its digits is 5786802, while the sum is 60.

The square root of 199997763 is about 14142.0565336163. The cubic root of 199997763 is about 584.8013672919.

The spelling of 199997763 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred sixty-three".