678842239 has 2 divisors, whose sum is σ = 678842240. Its totient is φ = 678842238.

The previous prime is 678842233. The next prime is 678842243. The reversal of 678842239 is 932248876.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 678842239 - 2¹¹ = 678840191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678842192 and 678842201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678842233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339421119 + 339421120.

It is an arithmetic number, because the mean of its divisors is an integer number (339421120).

Almost surely, 2^678842239 is an apocalyptic number.

678842239 is a deficient number, since it is larger than the sum of its proper divisors (1).

678842239 is an equidigital number, since it uses as much as digits as its factorization.

678842239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 49.

The square root of 678842239 is about 26054.6011099767. The cubic root of 678842239 is about 878.8665844657.

The spelling of 678842239 in words is "six hundred seventy-eight million, eight hundred forty-two thousand, two hundred thirty-nine".