199987500 has 72 divisors (see below), whose sum is σ = 583368912. Its totient is φ = 53320000.

The previous prime is 199987427. The next prime is 199987517. The reversal of 199987500 is 5789991.

It is a self number, because there is not a number n which added to its sum of digits gives 199987500.

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, 34834 + ... + 40166.

It is an arithmetic number, because the mean of its divisors is an integer number (8102346).

Almost surely, 2^199987500 is an apocalyptic number.

199987500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199987500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291684456).

199987500 is an abundant number, since it is smaller than the sum of its proper divisors (383381412).

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

199987500 is an equidigital number, since it uses as much as digits as its factorization.

199987500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5365 (or 5343 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 199987500 is about 14141.6936750872. The cubic root of 199987500 is about 584.7913639815.

The spelling of 199987500 in words is "one hundred ninety-nine million, nine hundred eighty-seven thousand, five hundred".