39439 has 2 divisors, whose sum is σ = 39440. Its totient is φ = 39438.

The previous prime is 39419. The next prime is 39443. The reversal of 39439 is 93493.

39439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (93493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39439 - 2¹³ = 31247 is a prime.

It is a Chen prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19719 + 19720.

It is an arithmetic number, because the mean of its divisors is an integer number (19720).

2³⁹⁴³⁹ is an apocalyptic number.

39439 is a deficient number, since it is larger than the sum of its proper divisors (1).

39439 is an equidigital number, since it uses as much as digits as its factorization.

39439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 28.

The square root of 39439 is about 198.5925476950. The cubic root of 39439 is about 34.0388828517.

The spelling of 39439 in words is "thirty-nine thousand, four hundred thirty-nine".