668949 has 8 divisors (see below), whose sum is σ = 920832. Its totient is φ = 431520.

The previous prime is 668947. The next prime is 668959. The reversal of 668949 is 949866.

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

It is not a de Polignac number, because 668949 - 2¹ = 668947 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 668949.

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 7 ways as a sum of consecutive naturals, for example, 3504 + ... + 3689.

It is an arithmetic number, because the mean of its divisors is an integer number (115104).

2⁶⁶⁸⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

668949 is a deficient number, since it is larger than the sum of its proper divisors (251883).

668949 is a wasteful number, since it uses less digits than its factorization.

668949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7227.

The product of its digits is 93312, while the sum is 42.

The square root of 668949 is about 817.8930247899. The cubic root of 668949 is about 87.4576230172.

The spelling of 668949 in words is "six hundred sixty-eight thousand, nine hundred forty-nine".