668983 has 4 divisors (see below), whose sum is σ = 764560. Its totient is φ = 573408.

The previous prime is 668963. The next prime is 668989. The reversal of 668983 is 389866.

668983 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 389866 = 2 ⋅194933.

It is a cyclic number.

It is not a de Polignac number, because 668983 - 2⁹ = 668471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668989) 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 3 ways as a sum of consecutive naturals, for example, 47778 + ... + 47791.

It is an arithmetic number, because the mean of its divisors is an integer number (191140).

2⁶⁶⁸⁹⁸³ is an apocalyptic number.

668983 is a deficient number, since it is larger than the sum of its proper divisors (95577).

668983 is an equidigital number, since it uses as much as digits as its factorization.

668983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95576.

The product of its digits is 62208, while the sum is 40.

The square root of 668983 is about 817.9138096401. The cubic root of 668983 is about 87.4591046991.

The spelling of 668983 in words is "six hundred sixty-eight thousand, nine hundred eighty-three".