668347 has 2 divisors, whose sum is σ = 668348. Its totient is φ = 668346.

The previous prime is 668303. The next prime is 668407. The reversal of 668347 is 743866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668347 is a prime.

It is not a weakly prime, because it can be changed into another prime (668047) 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, 334173 + 334174.

It is an arithmetic number, because the mean of its divisors is an integer number (334174).

2⁶⁶⁸³⁴⁷ is an apocalyptic number.

668347 is a deficient number, since it is larger than the sum of its proper divisors (1).

668347 is an equidigital number, since it uses as much as digits as its factorization.

668347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 668347 is about 817.5249231675. The cubic root of 668347 is about 87.4313802142.

The spelling of 668347 in words is "six hundred sixty-eight thousand, three hundred forty-seven".