18303612 has 24 divisors (see below), whose sum is σ = 44956800. Its totient is φ = 5780016.

The previous prime is 18303601. The next prime is 18303613. The reversal of 18303612 is 21630381.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18303613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39912 + ... + 40367.

It is an arithmetic number, because the mean of its divisors is an integer number (1873200).

Almost surely, 2^18303612 is an apocalyptic number.

18303612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18303612 is an abundant number, since it is smaller than the sum of its proper divisors (26653188).

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

18303612 is a wasteful number, since it uses less digits than its factorization.

18303612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80305 (or 80303 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 18303612 is about 4278.2720811094. The cubic root of 18303612 is about 263.5394288245.

Adding to 18303612 its reverse (21630381), we get a palindrome (39933993).

It can be divided in two parts, 18303 and 612, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 18303612 in words is "eighteen million, three hundred three thousand, six hundred twelve".