12638549 has 16 divisors (see below), whose sum is σ = 15876096. Its totient is φ = 9774000.

The previous prime is 12638543. The next prime is 12638551. The reversal of 12638549 is 94583621.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12638549 - 2⁴ = 12638533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638543) 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 15 ways as a sum of consecutive naturals, for example, 11084 + ... + 12170.

It is an arithmetic number, because the mean of its divisors is an integer number (992256).

Almost surely, 2^12638549 is an apocalyptic number.

It is an amenable number.

12638549 is a deficient number, since it is larger than the sum of its proper divisors (3237547).

12638549 is a wasteful number, since it uses less digits than its factorization.

12638549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256.

The product of its digits is 51840, while the sum is 38.

The square root of 12638549 is about 3555.0736982516. The cubic root of 12638549 is about 232.9337430645.

The spelling of 12638549 in words is "twelve million, six hundred thirty-eight thousand, five hundred forty-nine".