678839 has 8 divisors (see below), whose sum is σ = 797088. Its totient is φ = 565920.

The previous prime is 678833. The next prime is 678859. The reversal of 678839 is 938876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678839 - 2⁴ = 678823 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 678796 and 678805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678833) 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 in 7 ways as a sum of consecutive naturals, for example, 1052 + ... + 1569.

It is an arithmetic number, because the mean of its divisors is an integer number (99636).

2⁶⁷⁸⁸³⁹ is an apocalyptic number.

678839 is a deficient number, since it is larger than the sum of its proper divisors (118249).

678839 is a wasteful number, since it uses less digits than its factorization.

678839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665.

The product of its digits is 72576, while the sum is 41.

The square root of 678839 is about 823.9168647382. The cubic root of 678839 is about 87.8865186668.

The spelling of 678839 in words is "six hundred seventy-eight thousand, eight hundred thirty-nine".