668943 has 24 divisors (see below), whose sum is σ = 1095120. Its totient is φ = 389760.

The previous prime is 668939. The next prime is 668947. The reversal of 668943 is 349866.

668943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (668939) and next prime (668947).

It is not a de Polignac number, because 668943 - 2² = 668939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668898 and 668907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2755 + ... + 2987.

It is an arithmetic number, because the mean of its divisors is an integer number (45630).

2⁶⁶⁸⁹⁴³ is an apocalyptic number.

668943 is a deficient number, since it is larger than the sum of its proper divisors (426177).

668943 is a wasteful number, since it uses less digits than its factorization.

668943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 276 counting only the distinct ones).

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

The square root of 668943 is about 817.8893568203. The cubic root of 668943 is about 87.4573615387.

It can be divided in two parts, 66 and 8943, that added together give a palindrome (9009).

The spelling of 668943 in words is "six hundred sixty-eight thousand, nine hundred forty-three".