678939 has 4 divisors (see below), whose sum is σ = 905256. Its totient is φ = 452624.

The previous prime is 678907. The next prime is 678941. The reversal of 678939 is 939876.

It is a happy number.

678939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678939 - 2⁵ = 678907 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 678939.

It is not an unprimeable number, because it can be changed into a prime (678949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113154 + ... + 113159.

It is an arithmetic number, because the mean of its divisors is an integer number (226314).

2⁶⁷⁸⁹³⁹ is an apocalyptic number.

678939 is a deficient number, since it is larger than the sum of its proper divisors (226317).

678939 is a wasteful number, since it uses less digits than its factorization.

678939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226316.

The product of its digits is 81648, while the sum is 42.

The square root of 678939 is about 823.9775482378. The cubic root of 678939 is about 87.8908339857.

The spelling of 678939 in words is "six hundred seventy-eight thousand, nine hundred thirty-nine".