18138582 has 96 divisors (see below), whose sum is σ = 51217920. Its totient is φ = 4498560.

The previous prime is 18138563. The next prime is 18138587. The reversal of 18138582 is 28583181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138587) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31594 + ... + 32162.

It is an arithmetic number, because the mean of its divisors is an integer number (533520).

Almost surely, 2^18138582 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18138582, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25608960).

18138582 is an abundant number, since it is smaller than the sum of its proper divisors (33079338).

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

18138582 is a wasteful number, since it uses less digits than its factorization.

18138582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 615 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 18138582 is about 4258.9414177704. The cubic root of 18138582 is about 262.7449903279.

The spelling of 18138582 in words is "eighteen million, one hundred thirty-eight thousand, five hundred eighty-two".