18441668 has 72 divisors (see below), whose sum is σ = 40848192. Its totient is φ = 7128576.

The previous prime is 18441659. The next prime is 18441671. The reversal of 18441668 is 86614481.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 347930 + ... + 347982.

It is an arithmetic number, because the mean of its divisors is an integer number (567336).

Almost surely, 2^18441668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18441668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20424096).

18441668 is an abundant number, since it is smaller than the sum of its proper divisors (22406524).

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

18441668 is a wasteful number, since it uses less digits than its factorization.

18441668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 122 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 18441668 is about 4294.3763225875. The cubic root of 18441668 is about 264.2003567820.

The spelling of 18441668 in words is "eighteen million, four hundred forty-one thousand, six hundred sixty-eight".