18103812 has 12 divisors (see below), whose sum is σ = 42242256. Its totient is φ = 6034600.

The previous prime is 18103769. The next prime is 18103819. The reversal of 18103812 is 21830181.

It is a tau number, because it is divible by the number of its divisors (12).

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

It is not an unprimeable number, because it can be changed into a prime (18103819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754314 + ... + 754337.

It is an arithmetic number, because the mean of its divisors is an integer number (3520188).

Almost surely, 2^18103812 is an apocalyptic number.

18103812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18103812 is an abundant number, since it is smaller than the sum of its proper divisors (24138444).

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

18103812 is a wasteful number, since it uses less digits than its factorization.

18103812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508658 (or 1508656 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 18103812 is about 4254.8574594221. The cubic root of 18103812 is about 262.5769969141.

Adding to 18103812 its reverse (21830181), we get a palindrome (39933993).

It can be divided in two parts, 18103 and 812, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 18103812 in words is "eighteen million, one hundred three thousand, eight hundred twelve".