18215012 has 12 divisors (see below), whose sum is σ = 31990896. Its totient is φ = 9074760.

The previous prime is 18215003. The next prime is 18215017. The reversal of 18215012 is 21051281.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18215017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6914 + ... + 9177.

It is an arithmetic number, because the mean of its divisors is an integer number (2665908).

Almost surely, 2^18215012 is an apocalyptic number.

It is an amenable number.

18215012 is a deficient number, since it is larger than the sum of its proper divisors (13775884).

18215012 is a wasteful number, since it uses less digits than its factorization.

18215012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16378 (or 16376 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 18215012 is about 4267.9048724169. The cubic root of 18215012 is about 263.1135134335.

Adding to 18215012 its reverse (21051281), we get a palindrome (39266293).

The spelling of 18215012 in words is "eighteen million, two hundred fifteen thousand, twelve".