199666836 has 48 divisors (see below), whose sum is σ = 548110080. Its totient is φ = 62640000.

The previous prime is 199666829. The next prime is 199666861. The reversal of 199666836 is 638666991.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 52540 + ... + 56211.

It is an arithmetic number, because the mean of its divisors is an integer number (11418960).

Almost surely, 2^199666836 is an apocalyptic number.

It is an amenable number.

199666836 is an abundant number, since it is smaller than the sum of its proper divisors (348443244).

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

199666836 is a wasteful number, since it uses less digits than its factorization.

199666836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108781 (or 108773 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 199666836 is about 14130.3515879825. The cubic root of 199666836 is about 584.4786413487.

The spelling of 199666836 in words is "one hundred ninety-nine million, six hundred sixty-six thousand, eight hundred thirty-six".