13138639 has 2 divisors, whose sum is σ = 13138640. Its totient is φ = 13138638.

The previous prime is 13138591. The next prime is 13138673. The reversal of 13138639 is 93683131.

It is an a-pointer prime, because the next prime (13138673) can be obtained adding 13138639 to its sum of digits (34).

It is a strong prime.

It is an emirp because it is prime and its reverse (93683131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13138639 - 2⁷ = 13138511 is a prime.

It is a super-3 number, since 3×13138639³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13138339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6569319 + 6569320.

It is an arithmetic number, because the mean of its divisors is an integer number (6569320).

Almost surely, 2^13138639 is an apocalyptic number.

13138639 is a deficient number, since it is larger than the sum of its proper divisors (1).

13138639 is an equidigital number, since it uses as much as digits as its factorization.

13138639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 34.

The square root of 13138639 is about 3624.7260586146. The cubic root of 13138639 is about 235.9663781941.

The spelling of 13138639 in words is "thirteen million, one hundred thirty-eight thousand, six hundred thirty-nine".