13731439 has 2 divisors, whose sum is σ = 13731440. Its totient is φ = 13731438.

The previous prime is 13731409. The next prime is 13731451. The reversal of 13731439 is 93413731.

It is a strong prime.

It is an emirp because it is prime and its reverse (93413731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13731439 - 2⁵ = 13731407 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 13731439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13731409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6865719 + 6865720.

It is an arithmetic number, because the mean of its divisors is an integer number (6865720).

Almost surely, 2^13731439 is an apocalyptic number.

13731439 is a deficient number, since it is larger than the sum of its proper divisors (1).

13731439 is an equidigital number, since it uses as much as digits as its factorization.

13731439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 31.

The square root of 13731439 is about 3705.5956336330. The cubic root of 13731439 is about 239.4631460763.

The spelling of 13731439 in words is "thirteen million, seven hundred thirty-one thousand, four hundred thirty-nine".