18522090 has 48 divisors (see below), whose sum is σ = 48555936. Its totient is φ = 4898400.

The previous prime is 18522073. The next prime is 18522139. The reversal of 18522090 is 9022581.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11005 + ... + 12575.

It is an arithmetic number, because the mean of its divisors is an integer number (1011582).

Almost surely, 2^18522090 is an apocalyptic number.

18522090 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 18522090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24277968).

18522090 is an abundant number, since it is smaller than the sum of its proper divisors (30033846).

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

18522090 is a wasteful number, since it uses less digits than its factorization.

18522090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715 (or 1712 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 18522090 is about 4303.7297777625. The cubic root of 18522090 is about 264.5838490218.

The spelling of 18522090 in words is "eighteen million, five hundred twenty-two thousand, ninety".