18697648 has 20 divisors (see below), whose sum is σ = 36312408. Its totient is φ = 9326720.

The previous prime is 18697639. The next prime is 18697649. The reversal of 18697648 is 84679681.

It is not an unprimeable number, because it can be changed into a prime (18697649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7215 + ... + 9457.

Almost surely, 2^18697648 is an apocalyptic number.

It is an amenable number.

18697648 is a deficient number, since it is larger than the sum of its proper divisors (17614760).

18697648 is a wasteful number, since it uses less digits than its factorization.

18697648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2772 (or 2766 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The square root of 18697648 is about 4324.0777051297. The cubic root of 18697648 is about 265.4171571446.

The spelling of 18697648 in words is "eighteen million, six hundred ninety-seven thousand, six hundred forty-eight".