199805085 has 24 divisors (see below), whose sum is σ = 347072544. Its totient is φ = 106333920.

The previous prime is 199805077. The next prime is 199805107. The reversal of 199805085 is 580508991.

It is not a de Polignac number, because 199805085 - 2³ = 199805077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 199805085.

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, 17574 + ... + 26616.

It is an arithmetic number, because the mean of its divisors is an integer number (14461356).

Almost surely, 2^199805085 is an apocalyptic number.

199805085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199805085 is a deficient number, since it is larger than the sum of its proper divisors (147267459).

199805085 is a wasteful number, since it uses less digits than its factorization.

199805085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9545 (or 9542 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 199805085 is about 14135.2426579808. The cubic root of 199805085 is about 584.6135075873.

The spelling of 199805085 in words is "one hundred ninety-nine million, eight hundred five thousand, eighty-five".