18308666 has 8 divisors (see below), whose sum is σ = 28908480. Its totient is φ = 8672508.

The previous prime is 18308651. The next prime is 18308671. The reversal of 18308666 is 66680381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 481807 = 18308666 / (1 + 8 + 3 + 0 + 8 + 6 + 6 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240866 + ... + 240941.

It is an arithmetic number, because the mean of its divisors is an integer number (3613560).

Almost surely, 2^18308666 is an apocalyptic number.

18308666 is a deficient number, since it is larger than the sum of its proper divisors (10599814).

18308666 is a wasteful number, since it uses less digits than its factorization.

18308666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481828.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 18308666 is about 4278.8626993630. The cubic root of 18308666 is about 263.5636827933.

The spelling of 18308666 in words is "eighteen million, three hundred eight thousand, six hundred sixty-six".