199995805 has 24 divisors (see below), whose sum is σ = 255117600. Its totient is φ = 150485472.

The previous prime is 199995797. The next prime is 199995811. The reversal of 199995805 is 508599991.

It is not a de Polignac number, because 199995805 - 2³ = 199995797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 322786 + ... + 323404.

It is an arithmetic number, because the mean of its divisors is an integer number (10629900).

Almost surely, 2^199995805 is an apocalyptic number.

It is an amenable number.

199995805 is a deficient number, since it is larger than the sum of its proper divisors (55121795).

199995805 is a wasteful number, since it uses less digits than its factorization.

199995805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841 (or 822 counting only the distinct ones).

The product of its (nonzero) digits is 1312200, while the sum is 55.

The square root of 199995805 is about 14141.9873073059. The cubic root of 199995805 is about 584.7994588625.

It can be divided in two parts, 199 and 995805, that added together give a square (996004 = 998²).

The spelling of 199995805 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, eight hundred five".