12018656 has 48 divisors (see below), whose sum is σ = 25782624. Its totient is φ = 5481984.

The previous prime is 12018653. The next prime is 12018679. The reversal of 12018656 is 65681021.

It is a happy number.

It is a super-3 number, since 3×12018656³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12018653) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 69386 + ... + 69558.

It is an arithmetic number, because the mean of its divisors is an integer number (537138).

Almost surely, 2^12018656 is an apocalyptic number.

12018656 is a gapful number since it is divisible by the number (16) 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 12018656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12891312).

12018656 is an abundant number, since it is smaller than the sum of its proper divisors (13763968).

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

12018656 is a wasteful number, since it uses less digits than its factorization.

12018656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 12018656 is about 3466.7933310193. The cubic root of 12018656 is about 229.0614303519.

Adding to 12018656 its reverse (65681021), we get a palindrome (77699677).

The spelling of 12018656 in words is "twelve million, eighteen thousand, six hundred fifty-six".