199945685 has 8 divisors (see below), whose sum is σ = 241276320. Its totient is φ = 159062224.

The previous prime is 199945679. The next prime is 199945699. The reversal of 199945685 is 586549991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199945685 - 2¹⁸ = 199683541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199945685.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110807 + ... + 112596.

It is an arithmetic number, because the mean of its divisors is an integer number (30159540).

Almost surely, 2^199945685 is an apocalyptic number.

It is an amenable number.

199945685 is a deficient number, since it is larger than the sum of its proper divisors (41330635).

199945685 is a wasteful number, since it uses less digits than its factorization.

199945685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223587.

The product of its digits is 3499200, while the sum is 56.

The square root of 199945685 is about 14140.2151680942. The cubic root of 199945685 is about 584.7506035084.

The spelling of 199945685 in words is "one hundred ninety-nine million, nine hundred forty-five thousand, six hundred eighty-five".