199185990 has 16 divisors (see below), whose sum is σ = 478046448. Its totient is φ = 53116256.

The previous prime is 199185989. The next prime is 199186033. The reversal of 199185990 is 99581991.

It is a super-2 number, since 2×199185990² = 79350117224560200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 3319737 + ... + 3319796.

It is an arithmetic number, because the mean of its divisors is an integer number (29877903).

Almost surely, 2^199185990 is an apocalyptic number.

199185990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199185990 is an abundant number, since it is smaller than the sum of its proper divisors (278860458).

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

199185990 is a wasteful number, since it uses less digits than its factorization.

199185990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6639543.

The product of its (nonzero) digits is 262440, while the sum is 51.

The square root of 199185990 is about 14113.3266808361. The cubic root of 199185990 is about 584.0090755924.

The spelling of 199185990 in words is "one hundred ninety-nine million, one hundred eighty-five thousand, nine hundred ninety".