18447018 has 16 divisors (see below), whose sum is σ = 36968736. Its totient is φ = 6136560.

The previous prime is 18447001. The next prime is 18447061. The reversal of 18447018 is 81074481.

It is a self number, because there is not a number n which added to its sum of digits gives 18447018.

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, 405 + ... + 6087.

It is an arithmetic number, because the mean of its divisors is an integer number (2310546).

Almost surely, 2^18447018 is an apocalyptic number.

18447018 is an abundant number, since it is smaller than the sum of its proper divisors (18521718).

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

18447018 is a wasteful number, since it uses less digits than its factorization.

18447018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6229.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 18447018 is about 4294.9991850989. Note that the first 3 decimals coincide. The cubic root of 18447018 is about 264.2259028307.

The spelling of 18447018 in words is "eighteen million, four hundred forty-seven thousand, eighteen".