668923 has 8 divisors (see below), whose sum is σ = 697680. Its totient is φ = 640800.

The previous prime is 668903. The next prime is 668929. The reversal of 668923 is 329866.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 668923 - 2¹³ = 660731 is a prime.

It is a Duffinian number.

668923 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (668929) 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, 3648 + ... + 3826.

It is an arithmetic number, because the mean of its divisors is an integer number (87210).

2⁶⁶⁸⁹²³ is an apocalyptic number.

668923 is a deficient number, since it is larger than the sum of its proper divisors (28757).

668923 is a wasteful number, since it uses less digits than its factorization.

668923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317.

The product of its digits is 15552, while the sum is 34.

The square root of 668923 is about 817.8771301363. The cubic root of 668923 is about 87.4564899325.

The spelling of 668923 in words is "six hundred sixty-eight thousand, nine hundred twenty-three".