78485839 has 2 divisors, whose sum is σ = 78485840. Its totient is φ = 78485838.

The previous prime is 78485801. The next prime is 78485909. The reversal of 78485839 is 93858487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78485839 - 2⁹ = 78485327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78485639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39242919 + 39242920.

It is an arithmetic number, because the mean of its divisors is an integer number (39242920).

Almost surely, 2^78485839 is an apocalyptic number.

78485839 is a deficient number, since it is larger than the sum of its proper divisors (1).

78485839 is an equidigital number, since it uses as much as digits as its factorization.

78485839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 52.

The square root of 78485839 is about 8859.2233858279. The cubic root of 78485839 is about 428.1511370478.

The spelling of 78485839 in words is "seventy-eight million, four hundred eighty-five thousand, eight hundred thirty-nine".