12638421 has 24 divisors (see below), whose sum is σ = 19079424. Its totient is φ = 8052480.

The previous prime is 12638419. The next prime is 12638453. The reversal of 12638421 is 12483621.

12638421 is a `hidden beast` number, since 1 + 2 + 638 + 4 + 21 = 666.

It is not a de Polignac number, because 12638421 - 2¹ = 12638419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638471) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 26830 + ... + 27296.

It is an arithmetic number, because the mean of its divisors is an integer number (794976).

Almost surely, 2^12638421 is an apocalyptic number.

It is an amenable number.

12638421 is a deficient number, since it is larger than the sum of its proper divisors (6441003).

12638421 is a wasteful number, since it uses less digits than its factorization.

12638421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 598 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 12638421 is about 3555.0556957662. The cubic root of 12638421 is about 232.9329566974.

The spelling of 12638421 in words is "twelve million, six hundred thirty-eight thousand, four hundred twenty-one".