678343 has 2 divisors, whose sum is σ = 678344. Its totient is φ = 678342.

The previous prime is 678341. The next prime is 678367. The reversal of 678343 is 343876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678343 - 2¹ = 678341 is a prime.

Together with 678341, it forms a pair of twin primes.

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

678343 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339171 + 339172.

It is an arithmetic number, because the mean of its divisors is an integer number (339172).

2⁶⁷⁸³⁴³ is an apocalyptic number.

678343 is a deficient number, since it is larger than the sum of its proper divisors (1).

678343 is an equidigital number, since it uses as much as digits as its factorization.

678343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

The square root of 678343 is about 823.6158084933. The cubic root of 678343 is about 87.8651084185.

The spelling of 678343 in words is "six hundred seventy-eight thousand, three hundred forty-three".