1666323 has 12 divisors (see below), whose sum is σ = 2548728. Its totient is φ = 1045440.

The previous prime is 1666321. The next prime is 1666339. The reversal of 1666323 is 3236661.

It is not a de Polignac number, because 1666323 - 2¹ = 1666321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5293 + ... + 5598.

It is an arithmetic number, because the mean of its divisors is an integer number (212394).

2^1666323 is an apocalyptic number.

1666323 is a deficient number, since it is larger than the sum of its proper divisors (882405).

1666323 is a wasteful number, since it uses less digits than its factorization.

1666323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10914 (or 10911 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 1666323 is about 1290.8613403460. The cubic root of 1666323 is about 118.5549603517.

The spelling of 1666323 in words is "one million, six hundred sixty-six thousand, three hundred twenty-three".