668459 has 8 divisors (see below), whose sum is σ = 740928. Its totient is φ = 597960.

The previous prime is 668417. The next prime is 668471. The reversal of 668459 is 954866.

668459 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668459 - 2⁸ = 668203 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284 + ... + 1190.

It is an arithmetic number, because the mean of its divisors is an integer number (92616).

2⁶⁶⁸⁴⁵⁹ is an apocalyptic number.

668459 is a deficient number, since it is larger than the sum of its proper divisors (72469).

668459 is a wasteful number, since it uses less digits than its factorization.

668459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985.

The product of its digits is 51840, while the sum is 38.

The square root of 668459 is about 817.5934197387. The cubic root of 668459 is about 87.4362637890.

The spelling of 668459 in words is "six hundred sixty-eight thousand, four hundred fifty-nine".