18897916 has 6 divisors (see below), whose sum is σ = 33071360. Its totient is φ = 9448956.

The previous prime is 18897911. The next prime is 18897919. The reversal of 18897916 is 61979881.

It is a self number, because there is not a number n which added to its sum of digits gives 18897916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18897911) by changing a digit.

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, 2362236 + ... + 2362243.

Almost surely, 2^18897916 is an apocalyptic number.

It is an amenable number.

18897916 is a deficient number, since it is larger than the sum of its proper divisors (14173444).

18897916 is a wasteful number, since it uses less digits than its factorization.

18897916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4724483 (or 4724481 counting only the distinct ones).

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

The square root of 18897916 is about 4347.1733344784. The cubic root of 18897916 is about 266.3614097294.

The spelling of 18897916 in words is "eighteen million, eight hundred ninety-seven thousand, nine hundred sixteen".