12663918 has 32 divisors (see below), whose sum is σ = 29625600. Its totient is φ = 3998808.

The previous prime is 12663913. The next prime is 12663919. The reversal of 12663918 is 81936621.

12663918 is a `hidden beast` number, since 1 + 2 + 6 + 639 + 18 = 666.

12663918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12663918² = 320749638221448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12663913) 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, 5146 + ... + 7197.

It is an arithmetic number, because the mean of its divisors is an integer number (925800).

Almost surely, 2^12663918 is an apocalyptic number.

12663918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12663918 is an abundant number, since it is smaller than the sum of its proper divisors (16961682).

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

12663918 is a wasteful number, since it uses less digits than its factorization.

12663918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12373 (or 12367 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 12663918 is about 3558.6399087292. The cubic root of 12663918 is about 233.0894926599.

It can be divided in two parts, 1266 and 3918, that added together give a square (5184 = 72²).

The spelling of 12663918 in words is "twelve million, six hundred sixty-three thousand, nine hundred eighteen".