18446818 has 16 divisors (see below), whose sum is σ = 29869560. Its totient is φ = 8493696.

The previous prime is 18446801. The next prime is 18446821. The reversal of 18446818 is 81864481.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17833729 + 613089 = 4223^2 + 783^2 .

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, 20596 + ... + 21472.

Almost surely, 2^18446818 is an apocalyptic number.

18446818 is a deficient number, since it is larger than the sum of its proper divisors (11422742).

18446818 is a wasteful number, since it uses less digits than its factorization.

18446818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701.

The product of its digits is 49152, while the sum is 40.

The square root of 18446818 is about 4294.9759021443. The cubic root of 18446818 is about 264.2249479271.

The spelling of 18446818 in words is "eighteen million, four hundred forty-six thousand, eight hundred eighteen".