78860939 has 2 divisors, whose sum is σ = 78860940. Its totient is φ = 78860938.

The previous prime is 78860927. The next prime is 78860941. The reversal of 78860939 is 93906887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78860939 - 2⁴ = 78860923 is a prime.

Together with 78860941, 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 (78860989) 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, 39430469 + 39430470.

It is an arithmetic number, because the mean of its divisors is an integer number (39430470).

Almost surely, 2^78860939 is an apocalyptic number.

78860939 is a deficient number, since it is larger than the sum of its proper divisors (1).

78860939 is an equidigital number, since it uses as much as digits as its factorization.

78860939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 78860939 is about 8880.3681793043. The cubic root of 78860939 is about 428.8321275070.

The spelling of 78860939 in words is "seventy-eight million, eight hundred sixty thousand, nine hundred thirty-nine".