18289816 has 16 divisors (see below), whose sum is σ = 34351200. Its totient is φ = 9129504.

The previous prime is 18289811. The next prime is 18289829. The reversal of 18289816 is 61898281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18289811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4305 + ... + 7423.

It is an arithmetic number, because the mean of its divisors is an integer number (2146950).

Almost surely, 2^18289816 is an apocalyptic number.

It is an amenable number.

18289816 is a deficient number, since it is larger than the sum of its proper divisors (16061384).

18289816 is a wasteful number, since it uses less digits than its factorization.

18289816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3858 (or 3854 counting only the distinct ones).

The product of its digits is 55296, while the sum is 43.

The square root of 18289816 is about 4276.6594440053. The cubic root of 18289816 is about 263.4731995686.

It can be divided in two parts, 182 and 89816, that added together give a palindrome (89998).

The spelling of 18289816 in words is "eighteen million, two hundred eighty-nine thousand, eight hundred sixteen".