678309 has 4 divisors (see below), whose sum is σ = 904416. Its totient is φ = 452204.

The previous prime is 678299. The next prime is 678329. The reversal of 678309 is 903876.

It is a happy number.

678309 is nontrivially palindromic in base 2.

678309 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 678309 - 2¹⁷ = 547237 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 678309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678329) 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, 113049 + ... + 113054.

It is an arithmetic number, because the mean of its divisors is an integer number (226104).

2⁶⁷⁸³⁰⁹ is an apocalyptic number.

It is an amenable number.

678309 is a deficient number, since it is larger than the sum of its proper divisors (226107).

678309 is a wasteful number, since it uses less digits than its factorization.

678309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226106.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 678309 is about 823.5951675429. The cubic root of 678309 is about 87.8636403984.

The spelling of 678309 in words is "six hundred seventy-eight thousand, three hundred nine".