199999660 has 48 divisors (see below), whose sum is σ = 496560960. Its totient is φ = 66205440.

The previous prime is 199999649. The next prime is 199999661. The reversal of 199999660 is 66999991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a junction number, because it is equal to n+sod(n) for n = 199999595 and 199999604.

It is not an unprimeable number, because it can be changed into a prime (199999661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20571 + ... + 28690.

It is an arithmetic number, because the mean of its divisors is an integer number (10345020).

Almost surely, 2^199999660 is an apocalyptic number.

199999660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199999660 is an abundant number, since it is smaller than the sum of its proper divisors (296561300).

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

199999660 is a wasteful number, since it uses less digits than its factorization.

199999660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49306 (or 49304 counting only the distinct ones).

The product of its (nonzero) digits is 2125764, while the sum is 58.

The square root of 199999660 is about 14142.1236029106. The cubic root of 199999660 is about 584.8032162537.

The spelling of 199999660 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred sixty".