39138391 has 2 divisors, whose sum is σ = 39138392. Its totient is φ = 39138390.

The previous prime is 39138377. The next prime is 39138427. The reversal of 39138391 is 19383193.

39138391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (19383193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39138391 - 2¹⁵ = 39105623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39138391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39138311) 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, 19569195 + 19569196.

It is an arithmetic number, because the mean of its divisors is an integer number (19569196).

Almost surely, 2^39138391 is an apocalyptic number.

39138391 is a deficient number, since it is larger than the sum of its proper divisors (1).

39138391 is an equidigital number, since it uses as much as digits as its factorization.

39138391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 39138391 is about 6256.0683340258. The cubic root of 39138391 is about 339.5217931197.

The spelling of 39138391 in words is "thirty-nine million, one hundred thirty-eight thousand, three hundred ninety-one".