12385728 has 42 divisors (see below), whose sum is σ = 35503104. Its totient is φ = 4128384.

The previous prime is 12385727. The next prime is 12385757. The reversal of 12385728 is 82758321.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 12385692 and 12385701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12385727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10176 + ... + 11327.

It is an arithmetic number, because the mean of its divisors is an integer number (845312).

Almost surely, 2^12385728 is an apocalyptic number.

12385728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12385728 is an abundant number, since it is smaller than the sum of its proper divisors (23117376).

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

12385728 is a wasteful number, since it uses less digits than its factorization.

12385728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21521 (or 21508 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 12385728 is about 3519.3363010659. The cubic root of 12385728 is about 231.3700707840.

The spelling of 12385728 in words is "twelve million, three hundred eighty-five thousand, seven hundred twenty-eight".