678943 has 2 divisors, whose sum is σ = 678944. Its totient is φ = 678942.

The previous prime is 678941. The next prime is 678949. The reversal of 678943 is 349876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678943 - 2¹ = 678941 is a prime.

Together with 678941, it forms a pair of twin primes.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678941) 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, 339471 + 339472.

It is an arithmetic number, because the mean of its divisors is an integer number (339472).

2⁶⁷⁸⁹⁴³ is an apocalyptic number.

678943 is a deficient number, since it is larger than the sum of its proper divisors (1).

678943 is an equidigital number, since it uses as much as digits as its factorization.

678943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 678943 is about 823.9799754848. The cubic root of 678943 is about 87.8910065896.

The spelling of 678943 in words is "six hundred seventy-eight thousand, nine hundred forty-three".