18105412 has 12 divisors (see below), whose sum is σ = 34121836. Its totient is φ = 8356320.

The previous prime is 18105403. The next prime is 18105413. The reversal of 18105412 is 21450181.

It can be written as a sum of positive squares in 2 ways, for example, as 12278016 + 5827396 = 3504^2 + 2414^2 .

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

It is a plaindrome in base 16.

It is a zygodrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (18105413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174039 + ... + 174142.

Almost surely, 2^18105412 is an apocalyptic number.

It is an amenable number.

18105412 is a deficient number, since it is larger than the sum of its proper divisors (16016424).

18105412 is a wasteful number, since it uses less digits than its factorization.

18105412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348198 (or 348196 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 18105412 is about 4255.0454756677. The cubic root of 18105412 is about 262.5847321325.

Adding to 18105412 its reverse (21450181), we get a palindrome (39555593).

The spelling of 18105412 in words is "eighteen million, one hundred five thousand, four hundred twelve".