12665424 has 20 divisors (see below), whose sum is σ = 32719136. Its totient is φ = 4221792.

The previous prime is 12665423. The next prime is 12665441. The reversal of 12665424 is 42456621.

It is a junction number, because it is equal to n+sod(n) for n = 12665391 and 12665400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131884 + ... + 131979.

Almost surely, 2^12665424 is an apocalyptic number.

It is an amenable number.

12665424 is an abundant number, since it is smaller than the sum of its proper divisors (20053712).

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

12665424 is a wasteful number, since it uses less digits than its factorization.

12665424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263874 (or 263868 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 12665424 is about 3558.8515001332. The cubic root of 12665424 is about 233.0987320033.

The spelling of 12665424 in words is "twelve million, six hundred sixty-five thousand, four hundred twenty-four".