18423666 has 16 divisors (see below), whose sum is σ = 40941600. Its totient is φ = 6141204.

The previous prime is 18423659. The next prime is 18423679. The reversal of 18423666 is 66632481.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 18423666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170536 + ... + 170643.

It is an arithmetic number, because the mean of its divisors is an integer number (2558850).

Almost surely, 2^18423666 is an apocalyptic number.

18423666 is an abundant number, since it is smaller than the sum of its proper divisors (22517934).

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

18423666 is a wasteful number, since it uses less digits than its factorization.

18423666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341190 (or 341184 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 18423666 is about 4292.2798138052. The cubic root of 18423666 is about 264.1143616098.

The spelling of 18423666 in words is "eighteen million, four hundred twenty-three thousand, six hundred sixty-six".