666396 has 36 divisors (see below), whose sum is σ = 1710072. Its totient is φ = 218784.

The previous prime is 666353. The next prime is 666403. The reversal of 666396 is 693666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 666396.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3766 + ... + 3938.

It is an arithmetic number, because the mean of its divisors is an integer number (47502).

2⁶⁶⁶³⁹⁶ is an apocalyptic number.

It is an amenable number.

666396 is an abundant number, since it is smaller than the sum of its proper divisors (1043676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666396 is a wasteful number, since it uses less digits than its factorization.

666396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 285 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 666396 is about 816.3308152949. The cubic root of 666396 is about 87.3462224177.

The spelling of 666396 in words is "six hundred sixty-six thousand, three hundred ninety-six".