12638389 has 2 divisors, whose sum is σ = 12638390. Its totient is φ = 12638388.

The previous prime is 12638383. The next prime is 12638399. The reversal of 12638389 is 98383621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11957764 + 680625 = 3458^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 12638389 - 2⁵ = 12638357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12638383) 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 as a sum of consecutive naturals, namely, 6319194 + 6319195.

It is an arithmetic number, because the mean of its divisors is an integer number (6319195).

Almost surely, 2^12638389 is an apocalyptic number.

It is an amenable number.

12638389 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638389 is an equidigital number, since it uses as much as digits as its factorization.

12638389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 12638389 is about 3555.0511951307. The cubic root of 12638389 is about 232.9327601048.

It can be divided in two parts, 12 and 638389, that added together give a square (638401 = 799²).

The spelling of 12638389 in words is "twelve million, six hundred thirty-eight thousand, three hundred eighty-nine".