18789916 has 6 divisors (see below), whose sum is σ = 32882360. Its totient is φ = 9394956.

The previous prime is 18789893. The next prime is 18789923. The reversal of 18789916 is 61998781.

It is a self number, because there is not a number n which added to its sum of digits gives 18789916.

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 as a sum of consecutive naturals, namely, 2348736 + ... + 2348743.

Almost surely, 2^18789916 is an apocalyptic number.

It is an amenable number.

18789916 is a deficient number, since it is larger than the sum of its proper divisors (14092444).

18789916 is a wasteful number, since it uses less digits than its factorization.

18789916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4697483 (or 4697481 counting only the distinct ones).

The product of its digits is 217728, while the sum is 49.

The square root of 18789916 is about 4334.7336711729. The cubic root of 18789916 is about 265.8530290294.

The spelling of 18789916 in words is "eighteen million, seven hundred eighty-nine thousand, nine hundred sixteen".