18908816 has 20 divisors (see below), whose sum is σ = 37001724. Its totient is φ = 9360000.

The previous prime is 18908801. The next prime is 18908821. The reversal of 18908816 is 61880981.

It can be written as a sum of positive squares in 2 ways, for example, as 16777216 + 2131600 = 4096^2 + 1460^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4235 + ... + 7466.

Almost surely, 2^18908816 is an apocalyptic number.

18908816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18908816 is a deficient number, since it is larger than the sum of its proper divisors (18092908).

18908816 is a wasteful number, since it uses less digits than its factorization.

18908816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11810 (or 11804 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 18908816 is about 4348.4268419740. The cubic root of 18908816 is about 266.4126108132.

The spelling of 18908816 in words is "eighteen million, nine hundred eight thousand, eight hundred sixteen".