18518816 has 24 divisors (see below), whose sum is σ = 36578304. Its totient is φ = 9229120.

The previous prime is 18518813. The next prime is 18518821. The reversal of 18518816 is 61881581.

It is a self number, because there is not a number n which added to its sum of digits gives 18518816.

It is not an unprimeable number, because it can be changed into a prime (18518813) 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, 11501 + ... + 13011.

It is an arithmetic number, because the mean of its divisors is an integer number (1524096).

Almost surely, 2^18518816 is an apocalyptic number.

18518816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18518816 is a deficient number, since it is larger than the sum of its proper divisors (18059488).

18518816 is a wasteful number, since it uses less digits than its factorization.

18518816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904 (or 1896 counting only the distinct ones).

The product of its digits is 15360, while the sum is 38.

The square root of 18518816 is about 4303.3493932053. The cubic root of 18518816 is about 264.5682586544.

The spelling of 18518816 in words is "eighteen million, five hundred eighteen thousand, eight hundred sixteen".