78839 has 2 divisors, whose sum is σ = 78840. Its totient is φ = 78838.

The previous prime is 78823. The next prime is 78853. The reversal of 78839 is 93887.

It is a strong prime.

It is an emirp because it is prime and its reverse (93887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78839 - 2⁴ = 78823 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 78799 and 78808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39419 + 39420.

It is an arithmetic number, because the mean of its divisors is an integer number (39420).

2⁷⁸⁸³⁹ is an apocalyptic number.

78839 is a deficient number, since it is larger than the sum of its proper divisors (1).

78839 is an equidigital number, since it uses as much as digits as its factorization.

78839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 78839 is about 280.7828342331. The cubic root of 78839 is about 42.8792356991.

The spelling of 78839 in words is "seventy-eight thousand, eight hundred thirty-nine".