18199090 has 48 divisors (see below), whose sum is σ = 41052312. Its totient is φ = 5757696.

The previous prime is 18199073. The next prime is 18199117. The reversal of 18199090 is 9099181.

It can be written as a sum of positive squares in 4 ways, for example, as 12895281 + 5303809 = 3591^2 + 2303^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4942 + ... + 7798.

Almost surely, 2^18199090 is an apocalyptic number.

18199090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18199090 is an abundant number, since it is smaller than the sum of its proper divisors (22853222).

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

18199090 is a wasteful number, since it uses less digits than its factorization.

18199090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891 (or 2884 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 18199090 is about 4266.0391465621. The cubic root of 18199090 is about 263.0368273353.

Subtracting from 18199090 its reverse (9099181), we obtain a palindrome (9099909).

The spelling of 18199090 in words is "eighteen million, one hundred ninety-nine thousand, ninety".