199997766 has 24 divisors (see below), whose sum is σ = 437382504. Its totient is φ = 66042240.

The previous prime is 199997761. The next prime is 199997767. The reversal of 199997766 is 667799991.

It is a congruent number.

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, 49995 + ... + 53846.

It is an arithmetic number, because the mean of its divisors is an integer number (18224271).

Almost surely, 2^199997766 is an apocalyptic number.

199997766 is an abundant number, since it is smaller than the sum of its proper divisors (237384738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199997766 is a wasteful number, since it uses less digits than its factorization.

199997766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103956 (or 103953 counting only the distinct ones).

The product of its digits is 11573604, while the sum is 63.

The square root of 199997766 is about 14142.0566396829. The cubic root of 199997766 is about 584.8013702159.

The spelling of 199997766 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred sixty-six".