12987447 has 32 divisors (see below), whose sum is σ = 20079360. Its totient is φ = 7392000.

The previous prime is 12987437. The next prime is 12987461. The reversal of 12987447 is 74478921.

It is a happy number.

12987447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12987447 - 2⁷ = 12987319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12987399 and 12987408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12987437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39072 + ... + 39402.

It is an arithmetic number, because the mean of its divisors is an integer number (627480).

Almost surely, 2^12987447 is an apocalyptic number.

12987447 is a deficient number, since it is larger than the sum of its proper divisors (7091913).

12987447 is a wasteful number, since it uses less digits than its factorization.

12987447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415.

The product of its digits is 112896, while the sum is 42.

The square root of 12987447 is about 3603.8100671373. The cubic root of 12987447 is about 235.0577615672.

It can be divided in two parts, 129874 and 47, that added together give a palindrome (129921).

The spelling of 12987447 in words is "twelve million, nine hundred eighty-seven thousand, four hundred forty-seven".