12638993 has 2 divisors, whose sum is σ = 12638994. Its totient is φ = 12638992.

The previous prime is 12638987. The next prime is 12639019. The reversal of 12638993 is 39983621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12306064 + 332929 = 3508^2 + 577^2 .

It is a cyclic number.

It is not a de Polignac number, because 12638993 - 2¹⁴ = 12622609 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12638993.

It is not a weakly prime, because it can be changed into another prime (12638903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319496 + 6319497.

It is an arithmetic number, because the mean of its divisors is an integer number (6319497).

Almost surely, 2^12638993 is an apocalyptic number.

It is an amenable number.

12638993 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638993 is an equidigital number, since it uses as much as digits as its factorization.

12638993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 12638993 is about 3555.1361436659. The cubic root of 12638993 is about 232.9364707345.

It can be divided in two parts, 12638 and 993, that added together give a palindrome (13631).

The spelling of 12638993 in words is "twelve million, six hundred thirty-eight thousand, nine hundred ninety-three".