199085690 has 16 divisors (see below), whose sum is σ = 359634600. Its totient is φ = 79349760.

The previous prime is 199085683. The next prime is 199085693. The reversal of 199085690 is 96580991.

It can be written as a sum of positive squares in 4 ways, for example, as 191462569 + 7623121 = 13837^2 + 2761^2 .

It is a super-2 number, since 2×199085690² = 79270223925552200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199085693) by changing a digit.

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, 32615 + ... + 38234.

Almost surely, 2^199085690 is an apocalyptic number.

199085690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199085690 is a deficient number, since it is larger than the sum of its proper divisors (160548910).

199085690 is a wasteful number, since it uses less digits than its factorization.

199085690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71137.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 199085690 is about 14109.7728543021. The cubic root of 199085690 is about 583.9110333137.

The spelling of 199085690 in words is "one hundred ninety-nine million, eighty-five thousand, six hundred ninety".