199609660 has 24 divisors (see below), whose sum is σ = 427091616. Its totient is φ = 78336960.

The previous prime is 199609603. The next prime is 199609661. The reversal of 199609660 is 66906991.

It is a self number, because there is not a number n which added to its sum of digits gives 199609660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199609661) 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 7 ways as a sum of consecutive naturals, for example, 93096 + ... + 95215.

It is an arithmetic number, because the mean of its divisors is an integer number (17795484).

Almost surely, 2^199609660 is an apocalyptic number.

199609660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199609660 is an abundant number, since it is smaller than the sum of its proper divisors (227481956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199609660 is a wasteful number, since it uses less digits than its factorization.

199609660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188373 (or 188371 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 199609660 is about 14128.3282804442. The cubic root of 199609660 is about 584.4228461687.

The spelling of 199609660 in words is "one hundred ninety-nine million, six hundred nine thousand, six hundred sixty".