18873018 has 24 divisors (see below), whose sum is σ = 42670368. Its totient is φ = 6017352.

The previous prime is 18872993. The next prime is 18873053. The reversal of 18873018 is 81037881.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22380 + ... + 23207.

It is an arithmetic number, because the mean of its divisors is an integer number (1777932).

Almost surely, 2^18873018 is an apocalyptic number.

18873018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18873018 is an abundant number, since it is smaller than the sum of its proper divisors (23797350).

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

18873018 is a wasteful number, since it uses less digits than its factorization.

18873018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45618 (or 45615 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 18873018 is about 4344.3086906895. The cubic root of 18873018 is about 266.2443812872.

The spelling of 18873018 in words is "eighteen million, eight hundred seventy-three thousand, eighteen".