678839039 has 2 divisors, whose sum is σ = 678839040. Its totient is φ = 678839038.

The previous prime is 678839017. The next prime is 678839041. The reversal of 678839039 is 930938876.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678839039 is a prime.

Together with 678839041, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678839069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339419519 + 339419520.

It is an arithmetic number, because the mean of its divisors is an integer number (339419520).

Almost surely, 2^678839039 is an apocalyptic number.

678839039 is a deficient number, since it is larger than the sum of its proper divisors (1).

678839039 is an equidigital number, since it uses as much as digits as its factorization.

678839039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 678839039 is about 26054.5397004054. The cubic root of 678839039 is about 878.8652034981.

The spelling of 678839039 in words is "six hundred seventy-eight million, eight hundred thirty-nine thousand, thirty-nine".