12381728 has 24 divisors (see below), whose sum is σ = 25437888. Its totient is φ = 5921344.

The previous prime is 12381709. The next prime is 12381731. The reversal of 12381728 is 82718321.

12381728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 12381694 and 12381703.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7676 + ... + 9147.

It is an arithmetic number, because the mean of its divisors is an integer number (1059912).

Almost surely, 2^12381728 is an apocalyptic number.

It is an amenable number.

12381728 is an abundant number, since it is smaller than the sum of its proper divisors (13056160).

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

12381728 is a wasteful number, since it uses less digits than its factorization.

12381728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16856 (or 16848 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 12381728 is about 3518.7679662064. The cubic root of 12381728 is about 231.3451609327.

The spelling of 12381728 in words is "twelve million, three hundred eighty-one thousand, seven hundred twenty-eight".