18303012 has 144 divisors (see below), whose sum is σ = 58868992. Its totient is φ = 4665600.

The previous prime is 18303001. The next prime is 18303037. The reversal of 18303012 is 21030381.

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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121137 + ... + 121287.

Almost surely, 2^18303012 is an apocalyptic number.

18303012 is a gapful number since it is divisible by the number (12) 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 18303012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29434496).

18303012 is an abundant number, since it is smaller than the sum of its proper divisors (40565980).

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

18303012 is a wasteful number, since it uses less digits than its factorization.

18303012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 213 counting only the distinct ones).

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

The square root of 18303012 is about 4278.2019587673. The cubic root of 18303012 is about 263.5365491491.

Adding to 18303012 its reverse (21030381), we get a palindrome (39333393).

The spelling of 18303012 in words is "eighteen million, three hundred three thousand, twelve".