678493 has 2 divisors, whose sum is σ = 678494. Its totient is φ = 678492.

The previous prime is 678481. The next prime is 678499. The reversal of 678493 is 394876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 675684 + 2809 = 822^2 + 53^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678493 is a prime.

678493 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678499) 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, 339246 + 339247.

It is an arithmetic number, because the mean of its divisors is an integer number (339247).

2⁶⁷⁸⁴⁹³ is an apocalyptic number.

It is an amenable number.

678493 is a deficient number, since it is larger than the sum of its proper divisors (1).

678493 is an equidigital number, since it uses as much as digits as its factorization.

678493 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 678493 is about 823.7068653350. The cubic root of 678493 is about 87.8715843925.

The spelling of 678493 in words is "six hundred seventy-eight thousand, four hundred ninety-three".