12978784 has 48 divisors (see below), whose sum is σ = 31455648. Its totient is φ = 5133312.

The previous prime is 12978773. The next prime is 12978809. The reversal of 12978784 is 48787921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684 + ... + 5140.

It is an arithmetic number, because the mean of its divisors is an integer number (655326).

Almost surely, 2^12978784 is an apocalyptic number.

12978784 is a gapful number since it is divisible by the number (14) 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 12978784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15727824).

12978784 is an abundant number, since it is smaller than the sum of its proper divisors (18476864).

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

12978784 is a wasteful number, since it uses less digits than its factorization.

12978784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4487 (or 4479 counting only the distinct ones).

The product of its digits is 225792, while the sum is 46.

The square root of 12978784 is about 3602.6079442537. The cubic root of 12978784 is about 235.0054865174.

The spelling of 12978784 in words is "twelve million, nine hundred seventy-eight thousand, seven hundred eighty-four".