12918784 has 56 divisors (see below), whose sum is σ = 27523440. Its totient is φ = 6045696.

The previous prime is 12918779. The next prime is 12918811. The reversal of 12918784 is 48781921.

It is a happy number.

Its product of digits (32256) is a multiple of the sum of its prime factors (128).

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155607 + ... + 155689.

It is an arithmetic number, because the mean of its divisors is an integer number (491490).

Almost surely, 2^12918784 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 12918784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13761720).

12918784 is an abundant number, since it is smaller than the sum of its proper divisors (14604656).

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

12918784 is an frugal number, since it uses more digits than its factorization.

12918784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 104 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 12918784 is about 3594.2709970173. The cubic root of 12918784 is about 234.6427891224.

The spelling of 12918784 in words is "twelve million, nine hundred eighteen thousand, seven hundred eighty-four".