18473818 has 16 divisors (see below), whose sum is σ = 30646656. Its totient is φ = 8281440.

The previous prime is 18473813. The next prime is 18473857. The reversal of 18473818 is 81837481.

It is not an unprimeable number, because it can be changed into a prime (18473813) by changing a digit.

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, 4146 + ... + 7357.

It is an arithmetic number, because the mean of its divisors is an integer number (1915416).

Almost surely, 2^18473818 is an apocalyptic number.

18473818 is a deficient number, since it is larger than the sum of its proper divisors (12172838).

18473818 is a wasteful number, since it uses less digits than its factorization.

18473818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11589.

The product of its digits is 43008, while the sum is 40.

The square root of 18473818 is about 4298.1179602240. The cubic root of 18473818 is about 264.3537975347.

It can be divided in two parts, 18473 and 818, that added together give a palindrome (19291).

The spelling of 18473818 in words is "eighteen million, four hundred seventy-three thousand, eight hundred eighteen".