18512312 has 64 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 7182720.

The previous prime is 18512297. The next prime is 18512323. The reversal of 18512312 is 21321581.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 42737 + ... + 43167.

It is an arithmetic number, because the mean of its divisors is an integer number (680400).

Almost surely, 2^18512312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18512312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21772800).

18512312 is an abundant number, since it is smaller than the sum of its proper divisors (25033288).

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

18512312 is a wasteful number, since it uses less digits than its factorization.

18512312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 512 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 18512312 is about 4302.5936364012. The cubic root of 18512312 is about 264.5372819900.

Adding to 18512312 its reverse (21321581), we get a palindrome (39833893).

The spelling of 18512312 in words is "eighteen million, five hundred twelve thousand, three hundred twelve".