12909728 has 24 divisors (see below), whose sum is σ = 27371988. Its totient is φ = 5958144.

The previous prime is 12909709. The next prime is 12909751. The reversal of 12909728 is 82790921.

It can be written as a sum of positive squares in 2 ways, for example, as 12759184 + 150544 = 3572^2 + 388^2 .

It is a super-2 number, since 2×12909728² = 333322154067968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12909691 and 12909700.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15101 + ... + 15932.

Almost surely, 2^12909728 is an apocalyptic number.

It is an amenable number.

12909728 is an abundant number, since it is smaller than the sum of its proper divisors (14462260).

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

12909728 is a wasteful number, since it uses less digits than its factorization.

12909728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31056 (or 31048 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 12909728 is about 3593.0109935818. The cubic root of 12909728 is about 234.5879485169.

The spelling of 12909728 in words is "twelve million, nine hundred nine thousand, seven hundred twenty-eight".