12563638 has 4 divisors (see below), whose sum is σ = 18845460. Its totient is φ = 6281818.

The previous prime is 12563591. The next prime is 12563669. The reversal of 12563638 is 83636521.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3140908 + ... + 3140911.

It is an arithmetic number, because the mean of its divisors is an integer number (4711365).

Almost surely, 2^12563638 is an apocalyptic number.

12563638 is a deficient number, since it is larger than the sum of its proper divisors (6281822).

12563638 is an equidigital number, since it uses as much as digits as its factorization.

12563638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6281821.

The product of its digits is 25920, while the sum is 34.

The square root of 12563638 is about 3544.5222527162. The cubic root of 12563638 is about 232.4726171165.

The spelling of 12563638 in words is "twelve million, five hundred sixty-three thousand, six hundred thirty-eight".