12928447 has 4 divisors (see below), whose sum is σ = 14775376. Its totient is φ = 11081520.

The previous prime is 12928439. The next prime is 12928459. The reversal of 12928447 is 74482921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74482921 = 47 ⋅1584743.

It is a cyclic number.

It is not a de Polignac number, because 12928447 - 2³ = 12928439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12928427) 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, 923454 + ... + 923467.

It is an arithmetic number, because the mean of its divisors is an integer number (3693844).

Almost surely, 2^12928447 is an apocalyptic number.

12928447 is a deficient number, since it is larger than the sum of its proper divisors (1846929).

12928447 is an equidigital number, since it uses as much as digits as its factorization.

12928447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846928.

The product of its digits is 32256, while the sum is 37.

The square root of 12928447 is about 3595.6149682634. The cubic root of 12928447 is about 234.7012772947.

It can be divided in two parts, 129 and 28447, that multiplied together give a palindrome (3669663).

The spelling of 12928447 in words is "twelve million, nine hundred twenty-eight thousand, four hundred forty-seven".