18138030 has 64 divisors (see below), whose sum is σ = 46061568. Its totient is φ = 4561920.

The previous prime is 18138017. The next prime is 18138041. The reversal of 18138030 is 3083181.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66795 + ... + 67065.

It is an arithmetic number, because the mean of its divisors is an integer number (719712).

Almost surely, 2^18138030 is an apocalyptic number.

18138030 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 18138030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23030784).

18138030 is an abundant number, since it is smaller than the sum of its proper divisors (27923538).

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

18138030 is a wasteful number, since it uses less digits than its factorization.

18138030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18138030 is about 4258.8766124414. The cubic root of 18138030 is about 262.7423249834.

The spelling of 18138030 in words is "eighteen million, one hundred thirty-eight thousand, thirty".