668443 has 4 divisors (see below), whose sum is σ = 670248. Its totient is φ = 666640.

The previous prime is 668417. The next prime is 668471. The reversal of 668443 is 344866.

668443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344866 = 2 ⋅172433.

It is a cyclic number.

It is not a de Polignac number, because 668443 - 2¹³ = 660251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121 + ... + 1162.

It is an arithmetic number, because the mean of its divisors is an integer number (167562).

2⁶⁶⁸⁴⁴³ is an apocalyptic number.

668443 is a deficient number, since it is larger than the sum of its proper divisors (1805).

668443 is a wasteful number, since it uses less digits than its factorization.

668443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804.

The product of its digits is 13824, while the sum is 31.

The square root of 668443 is about 817.5836348656. The cubic root of 668443 is about 87.4355661689.

It can be divided in two parts, 668 and 443, that added together give a palindrome (1111).

The spelling of 668443 in words is "six hundred sixty-eight thousand, four hundred forty-three".