199998090 has 48 divisors (see below), whose sum is σ = 520802568. Its totient is φ = 53250048.

The previous prime is 199998089. The next prime is 199998107. The reversal of 199998090 is 90899991.

It can be written as a sum of positive squares in 4 ways, for example, as 195188841 + 4809249 = 13971^2 + 2193^2 .

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 23 ways as a sum of consecutive naturals, for example, 75834 + ... + 78426.

Almost surely, 2^199998090 is an apocalyptic number.

199998090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199998090 is an abundant number, since it is smaller than the sum of its proper divisors (320804478).

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

199998090 is a wasteful number, since it uses less digits than its factorization.

199998090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463 (or 3460 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The square root of 199998090 is about 14142.0680948721. The cubic root of 199998090 is about 584.8016860120.

The spelling of 199998090 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, ninety".