666393 has 16 divisors (see below), whose sum is σ = 1094016. Its totient is φ = 351360.

The previous prime is 666353. The next prime is 666403. The reversal of 666393 is 393666.

It is not a de Polignac number, because 666393 - 2⁶ = 666329 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 948 + ... + 1493.

It is an arithmetic number, because the mean of its divisors is an integer number (68376).

2⁶⁶⁶³⁹³ is an apocalyptic number.

It is an amenable number.

666393 is a deficient number, since it is larger than the sum of its proper divisors (427623).

666393 is a wasteful number, since it uses less digits than its factorization.

666393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464.

The product of its digits is 17496, while the sum is 33.

The square root of 666393 is about 816.3289778025. The cubic root of 666393 is about 87.3460913449.

The spelling of 666393 in words is "six hundred sixty-six thousand, three hundred ninety-three".