12531638 has 16 divisors (see below), whose sum is σ = 21889440. Its totient is φ = 5269056.

The previous prime is 12531637. The next prime is 12531643. The reversal of 12531638 is 83613521.

It is a self number, because there is not a number n which added to its sum of digits gives 12531638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7703 + ... + 9186.

It is an arithmetic number, because the mean of its divisors is an integer number (1368090).

Almost surely, 2^12531638 is an apocalyptic number.

12531638 is a deficient number, since it is larger than the sum of its proper divisors (9357802).

12531638 is a wasteful number, since it uses less digits than its factorization.

12531638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16951.

The product of its digits is 4320, while the sum is 29.

The square root of 12531638 is about 3540.0053672276. The cubic root of 12531638 is about 232.2750775027.

The spelling of 12531638 in words is "twelve million, five hundred thirty-one thousand, six hundred thirty-eight".