18399030 has 96 divisors (see below), whose sum is σ = 50595840. Its totient is φ = 4268160.

The previous prime is 18399023. The next prime is 18399047. The reversal of 18399030 is 3099381.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18398982 and 18399000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96235 + ... + 96425.

It is an arithmetic number, because the mean of its divisors is an integer number (527040).

Almost surely, 2^18399030 is an apocalyptic number.

18399030 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 18399030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25297920).

18399030 is an abundant number, since it is smaller than the sum of its proper divisors (32196810).

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

18399030 is a wasteful number, since it uses less digits than its factorization.

18399030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 18399030 is about 4289.4090502073. The cubic root of 18399030 is about 263.9965851257.

The spelling of 18399030 in words is "eighteen million, three hundred ninety-nine thousand, thirty".