18615012 has 72 divisors (see below), whose sum is σ = 48083616. Its totient is φ = 5601024.

The previous prime is 18615011. The next prime is 18615029. The reversal of 18615012 is 21051681.

It is not an unprimeable number, because it can be changed into a prime (18615011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135808 + ... + 135944.

It is an arithmetic number, because the mean of its divisors is an integer number (667828).

Almost surely, 2^18615012 is an apocalyptic number.

18615012 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 18615012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24041808).

18615012 is an abundant number, since it is smaller than the sum of its proper divisors (29468604).

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

18615012 is a wasteful number, since it uses less digits than its factorization.

18615012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 222 counting only the distinct ones).

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

The square root of 18615012 is about 4314.5117916168. The cubic root of 18615012 is about 265.0255677241.

Adding to 18615012 its reverse (21051681), we get a palindrome (39666693).

The spelling of 18615012 in words is "eighteen million, six hundred fifteen thousand, twelve".