12147728 has 20 divisors (see below), whose sum is σ = 23599680. Its totient is φ = 6057504.

The previous prime is 12147727. The next prime is 12147739. The reversal of 12147728 is 82774121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12147694 and 12147703.

It is not an unprimeable number, because it can be changed into a prime (12147727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7013 + ... + 8571.

It is an arithmetic number, because the mean of its divisors is an integer number (1179984).

Almost surely, 2^12147728 is an apocalyptic number.

It is an amenable number.

12147728 is a deficient number, since it is larger than the sum of its proper divisors (11451952).

12147728 is a wasteful number, since it uses less digits than its factorization.

12147728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054 (or 2048 counting only the distinct ones).

The product of its digits is 6272, while the sum is 32.

The square root of 12147728 is about 3485.3590919732. The cubic root of 12147728 is about 229.8784991537.

The spelling of 12147728 in words is "twelve million, one hundred forty-seven thousand, seven hundred twenty-eight".