18243666 has 24 divisors (see below), whose sum is σ = 45175104. Its totient is φ = 5212440.

The previous prime is 18243619. The next prime is 18243671. The reversal of 18243666 is 66634281.

It is a self number, because there is not a number n which added to its sum of digits gives 18243666.

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, 72270 + ... + 72521.

It is an arithmetic number, because the mean of its divisors is an integer number (1882296).

Almost surely, 2^18243666 is an apocalyptic number.

18243666 is an abundant number, since it is smaller than the sum of its proper divisors (26931438).

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

18243666 is a wasteful number, since it uses less digits than its factorization.

18243666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144806 (or 144803 counting only the distinct ones).

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

The square root of 18243666 is about 4271.2604696974. The cubic root of 18243666 is about 263.2514089367.

The spelling of 18243666 in words is "eighteen million, two hundred forty-three thousand, six hundred sixty-six".