678899839 has 2 divisors, whose sum is σ = 678899840. Its totient is φ = 678899838.

The previous prime is 678899827. The next prime is 678899861. The reversal of 678899839 is 938998876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678899839 - 2⁵ = 678899807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678899239) 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, 339449919 + 339449920.

It is an arithmetic number, because the mean of its divisors is an integer number (339449920).

Almost surely, 2^678899839 is an apocalyptic number.

678899839 is a deficient number, since it is larger than the sum of its proper divisors (1).

678899839 is an equidigital number, since it uses as much as digits as its factorization.

678899839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47029248, while the sum is 67.

The square root of 678899839 is about 26055.7064575114. The cubic root of 678899839 is about 878.8914411411.

The spelling of 678899839 in words is "six hundred seventy-eight million, eight hundred ninety-nine thousand, eight hundred thirty-nine".