199790000 has 50 divisors (see below), whose sum is σ = 483735780. Its totient is φ = 79912000.

The previous prime is 199789991. The next prime is 199790023. The reversal of 199790000 is 97991.

It is a happy number.

199790000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (50).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 11 + ... + 19989.

Almost surely, 2^199790000 is an apocalyptic number.

199790000 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 199790000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241867890).

199790000 is an abundant number, since it is smaller than the sum of its proper divisors (283945780).

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

199790000 is an equidigital number, since it uses as much as digits as its factorization.

199790000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20007 (or 19986 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 199790000 is about 14134.7090525415. The cubic root of 199790000 is about 584.5987947206.

The spelling of 199790000 in words is "one hundred ninety-nine million, seven hundred ninety thousand".