666893 has 4 divisors (see below), whose sum is σ = 706140. Its totient is φ = 627648.

The previous prime is 666889. The next prime is 666901. The reversal of 666893 is 398666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 619369 + 47524 = 787^2 + 218^2 .

It is a cyclic number.

It is not a de Polignac number, because 666893 - 2² = 666889 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666823) 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, 19598 + ... + 19631.

It is an arithmetic number, because the mean of its divisors is an integer number (176535).

2⁶⁶⁶⁸⁹³ is an apocalyptic number.

It is an amenable number.

666893 is a deficient number, since it is larger than the sum of its proper divisors (39247).

666893 is a wasteful number, since it uses less digits than its factorization.

666893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39246.

The product of its digits is 46656, while the sum is 38.

The square root of 666893 is about 816.6351694606. The cubic root of 666893 is about 87.3679313740.

The spelling of 666893 in words is "six hundred sixty-six thousand, eight hundred ninety-three".