199188990 has 384 divisors, whose sum is σ = 729308160. Its totient is φ = 37635840.

The previous prime is 199188911. The next prime is 199189007. The reversal of 199188990 is 99881991.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2972937 + ... + 2973003.

It is an arithmetic number, because the mean of its divisors is an integer number (1899240).

Almost surely, 2^199188990 is an apocalyptic number.

199188990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 199188990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364654080).

199188990 is an abundant number, since it is smaller than the sum of its proper divisors (530119170).

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

199188990 is a wasteful number, since it uses less digits than its factorization.

199188990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 54.

The square root of 199188990 is about 14113.4329629612. The cubic root of 199188990 is about 584.0120075563.

The spelling of 199188990 in words is "one hundred ninety-nine million, one hundred eighty-eight thousand, nine hundred ninety".