18123030 has 48 divisors (see below), whose sum is σ = 47932560. Its totient is φ = 4749504.

The previous prime is 18122989. The next prime is 18123041. The reversal of 18123030 is 3032181.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 18122994 and 18123012.

It is a congruent number.

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, 3604 + ... + 7016.

It is an arithmetic number, because the mean of its divisors is an integer number (998595).

Almost surely, 2^18123030 is an apocalyptic number.

18123030 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 18123030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23966280).

18123030 is an abundant number, since it is smaller than the sum of its proper divisors (29809530).

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

18123030 is a wasteful number, since it uses less digits than its factorization.

18123030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3485 (or 3482 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 18123030 is about 4257.1152204280. The cubic root of 18123030 is about 262.6698764356.

The spelling of 18123030 in words is "eighteen million, one hundred twenty-three thousand, thirty".