18105612 has 96 divisors (see below), whose sum is σ = 52899840. Its totient is φ = 4700160.

The previous prime is 18105601. The next prime is 18105631. The reversal of 18105612 is 21650181.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44064 + ... + 44472.

It is an arithmetic number, because the mean of its divisors is an integer number (551040).

Almost surely, 2^18105612 is an apocalyptic number.

18105612 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 18105612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26449920).

18105612 is an abundant number, since it is smaller than the sum of its proper divisors (34794228).

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

18105612 is a wasteful number, since it uses less digits than its factorization.

18105612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 18105612 is about 4255.0689771142. The cubic root of 18105612 is about 262.5856990027.

Adding to 18105612 its reverse (21650181), we get a palindrome (39755793).

The spelling of 18105612 in words is "eighteen million, one hundred five thousand, six hundred twelve".