78839347 has 2 divisors, whose sum is σ = 78839348. Its totient is φ = 78839346.

The previous prime is 78839333. The next prime is 78839357. The reversal of 78839347 is 74393887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78839347 - 2⁷ = 78839219 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78839347.

It is not a weakly prime, because it can be changed into another prime (78839317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39419673 + 39419674.

It is an arithmetic number, because the mean of its divisors is an integer number (39419674).

Almost surely, 2^78839347 is an apocalyptic number.

78839347 is a deficient number, since it is larger than the sum of its proper divisors (1).

78839347 is an equidigital number, since it uses as much as digits as its factorization.

78839347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 49.

The square root of 78839347 is about 8879.1523807174. The cubic root of 78839347 is about 428.7929860824.

The spelling of 78839347 in words is "seventy-eight million, eight hundred thirty-nine thousand, three hundred forty-seven".