668349 has 24 divisors (see below), whose sum is σ = 1084512. Its totient is φ = 393120.

The previous prime is 668347. The next prime is 668407. The reversal of 668349 is 943866.

It is not a de Polignac number, because 668349 - 2¹ = 668347 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668347) 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 in 23 ways as a sum of consecutive naturals, for example, 4179 + ... + 4335.

It is an arithmetic number, because the mean of its divisors is an integer number (45188).

2⁶⁶⁸³⁴⁹ is an apocalyptic number.

It is an amenable number.

668349 is a deficient number, since it is larger than the sum of its proper divisors (416163).

668349 is a wasteful number, since it uses less digits than its factorization.

668349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 214 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 668349 is about 817.5261463709. The cubic root of 668349 is about 87.4314674257.

The spelling of 668349 in words is "six hundred sixty-eight thousand, three hundred forty-nine".