18097980 has 48 divisors (see below), whose sum is σ = 51166080. Its totient is φ = 4779328.

The previous prime is 18097931. The next prime is 18097991. The reversal of 18097980 is 8979081.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 5011 + ... + 7829.

It is an arithmetic number, because the mean of its divisors is an integer number (1065960).

Almost surely, 2^18097980 is an apocalyptic number.

18097980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18097980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25583040).

18097980 is an abundant number, since it is smaller than the sum of its proper divisors (33068100).

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

18097980 is a wasteful number, since it uses less digits than its factorization.

18097980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938 (or 2936 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 18097980 is about 4254.1720698627. The cubic root of 18097980 is about 262.5487981842.

The spelling of 18097980 in words is "eighteen million, ninety-seven thousand, nine hundred eighty".