678243 has 16 divisors (see below), whose sum is σ = 970880. Its totient is φ = 419904.

The previous prime is 678229. The next prime is 678253. The reversal of 678243 is 342876.

678243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 678243 - 2⁵ = 678211 is a prime.

It is a Duffinian number.

678243 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 678243.

It is not an unprimeable number, because it can be changed into a prime (678203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4080 + ... + 4242.

It is an arithmetic number, because the mean of its divisors is an integer number (60680).

2⁶⁷⁸²⁴³ is an apocalyptic number.

678243 is a deficient number, since it is larger than the sum of its proper divisors (292637).

678243 is a wasteful number, since it uses less digits than its factorization.

678243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258.

The product of its digits is 8064, while the sum is 30.

The square root of 678243 is about 823.5550983389. Note that the first 3 decimals coincide. The cubic root of 678243 is about 87.8607905721.

The spelling of 678243 in words is "six hundred seventy-eight thousand, two hundred forty-three".