199609685 has 32 divisors (see below), whose sum is σ = 268272000. Its totient is φ = 141352960.

The previous prime is 199609681. The next prime is 199609703. The reversal of 199609685 is 586906991.

It is not a de Polignac number, because 199609685 - 2² = 199609681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199609681) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 444341 + ... + 444789.

It is an arithmetic number, because the mean of its divisors is an integer number (8383500).

Almost surely, 2^199609685 is an apocalyptic number.

It is an amenable number.

199609685 is a deficient number, since it is larger than the sum of its proper divisors (68662315).

199609685 is a wasteful number, since it uses less digits than its factorization.

199609685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The square root of 199609685 is about 14128.3291651915. The cubic root of 199609685 is about 584.4228705673.

The spelling of 199609685 in words is "one hundred ninety-nine million, six hundred nine thousand, six hundred eighty-five".