18634648 has 8 divisors (see below), whose sum is σ = 34939980. Its totient is φ = 9317320.

The previous prime is 18634639. The next prime is 18634667. The reversal of 18634648 is 84643681.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 18634648.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1164658 + ... + 1164673.

Almost surely, 2^18634648 is an apocalyptic number.

It is an amenable number.

18634648 is a deficient number, since it is larger than the sum of its proper divisors (16305332).

18634648 is a wasteful number, since it uses less digits than its factorization.

18634648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329337 (or 2329333 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 18634648 is about 4316.7867679560. The cubic root of 18634648 is about 265.1187221685.

The spelling of 18634648 in words is "eighteen million, six hundred thirty-four thousand, six hundred forty-eight".