18300000 has 144 divisors (see below), whose sum is σ = 61027344. Its totient is φ = 4800000.

The previous prime is 18299993. The next prime is 18300001. The reversal of 18300000 is 381.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18300001) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 299970 + ... + 300030.

It is an arithmetic number, because the mean of its divisors is an integer number (423801).

Almost surely, 2^18300000 is an apocalyptic number.

18300000 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 18300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30513672).

18300000 is an abundant number, since it is smaller than the sum of its proper divisors (42727344).

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

18300000 is an frugal number, since it uses more digits than its factorization.

18300000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 18300000 is about 4277.8499272415. The cubic root of 18300000 is about 263.5220922274.

Adding to 18300000 its reverse (381), we get a palindrome (18300381).

The spelling of 18300000 in words is "eighteen million, three hundred thousand".