199807805 has 8 divisors (see below), whose sum is σ = 240462432. Its totient is φ = 159384208.

The previous prime is 199807793. The next prime is 199807813. The reversal of 199807805 is 508708991.

It is a happy number.

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 199807805 - 2⁸ = 199807549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199807805.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 55847 + ... + 59316.

It is an arithmetic number, because the mean of its divisors is an integer number (30057804).

Almost surely, 2^199807805 is an apocalyptic number.

It is an amenable number.

199807805 is a deficient number, since it is larger than the sum of its proper divisors (40654627).

199807805 is a wasteful number, since it uses less digits than its factorization.

199807805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115515.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 199807805 is about 14135.3388710706. The cubic root of 199807805 is about 584.6161604085.

The spelling of 199807805 in words is "one hundred ninety-nine million, eight hundred seven thousand, eight hundred five".