18408666 has 8 divisors (see below), whose sum is σ = 36817344. Its totient is φ = 6136220.

The previous prime is 18408661. The next prime is 18408679. The reversal of 18408666 is 66680481.

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

18408666 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18408661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1534050 + ... + 1534061.

It is an arithmetic number, because the mean of its divisors is an integer number (4602168).

Almost surely, 2^18408666 is an apocalyptic number.

18408666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18408666 is a wasteful number, since it uses less digits than its factorization.

18408666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3068116.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 18408666 is about 4290.5321348290. The cubic root of 18408666 is about 264.0426641333.

The spelling of 18408666 in words is "eighteen million, four hundred eight thousand, six hundred sixty-six".