78539 has 2 divisors, whose sum is σ = 78540. Its totient is φ = 78538.

The previous prime is 78517. The next prime is 78541. The reversal of 78539 is 93587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78539 - 2⁸ = 78283 is a prime.

Together with 78541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39269 + 39270.

It is an arithmetic number, because the mean of its divisors is an integer number (39270).

2⁷⁸⁵³⁹ is an apocalyptic number.

78539 is a deficient number, since it is larger than the sum of its proper divisors (1).

78539 is an equidigital number, since it uses as much as digits as its factorization.

78539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The square root of 78539 is about 280.2481043647. The cubic root of 78539 is about 42.8247782107.

The spelling of 78539 in words is "seventy-eight thousand, five hundred thirty-nine".