18516798 has 24 divisors (see below), whose sum is σ = 41205528. Its totient is φ = 6005232.

The previous prime is 18516781. The next prime is 18516821. The reversal of 18516798 is 89761581.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 13236 + ... + 14567.

It is an arithmetic number, because the mean of its divisors is an integer number (1716897).

Almost surely, 2^18516798 is an apocalyptic number.

18516798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18516798 is an abundant number, since it is smaller than the sum of its proper divisors (22688730).

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

18516798 is a wasteful number, since it uses less digits than its factorization.

18516798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27848 (or 27845 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 18516798 is about 4303.1149182888. The cubic root of 18516798 is about 264.5586482822.

It can be divided in two parts, 1851 and 6798, that added together give a square (8649 = 93²).

The spelling of 18516798 in words is "eighteen million, five hundred sixteen thousand, seven hundred ninety-eight".