18105012 has 48 divisors (see below), whose sum is σ = 47839680. Its totient is φ = 5919264.

The previous prime is 18105007. The next prime is 18105013. The reversal of 18105012 is 21050181.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18105013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4143 + ... + 7305.

It is an arithmetic number, because the mean of its divisors is an integer number (996660).

Almost surely, 2^18105012 is an apocalyptic number.

18105012 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 18105012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23919840).

18105012 is an abundant number, since it is smaller than the sum of its proper divisors (29734668).

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

18105012 is a wasteful number, since it uses less digits than its factorization.

18105012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3229 (or 3221 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 18105012 is about 4254.9984723852. The cubic root of 18105012 is about 262.5827983706.

Adding to 18105012 its reverse (21050181), we get a palindrome (39155193).

The spelling of 18105012 in words is "eighteen million, one hundred five thousand, twelve".