12513638 has 4 divisors (see below), whose sum is σ = 18770460. Its totient is φ = 6256818.

The previous prime is 12513629. The next prime is 12513643. The reversal of 12513638 is 83631521.

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

It is a super-2 number, since 2×12513638² = 313182271990088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12513638.

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, 3128408 + ... + 3128411.

It is an arithmetic number, because the mean of its divisors is an integer number (4692615).

Almost surely, 2^12513638 is an apocalyptic number.

12513638 is a deficient number, since it is larger than the sum of its proper divisors (6256822).

12513638 is an equidigital number, since it uses as much as digits as its factorization.

12513638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6256821.

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

The square root of 12513638 is about 3537.4620846025. The cubic root of 12513638 is about 232.1638136550.

The spelling of 12513638 in words is "twelve million, five hundred thirteen thousand, six hundred thirty-eight".