18894663 has 12 divisors (see below), whose sum is σ = 27667120. Its totient is φ = 12423456.

The previous prime is 18894649. The next prime is 18894671. The reversal of 18894663 is 36649881.

18894663 is a `hidden beast` number, since 188 + 9 + 466 + 3 = 666.

It is not a de Polignac number, because 18894663 - 2¹⁰ = 18893639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18894613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13723 + ... + 15036.

Almost surely, 2^18894663 is an apocalyptic number.

18894663 is a deficient number, since it is larger than the sum of its proper divisors (8772457).

18894663 is a wasteful number, since it uses less digits than its factorization.

18894663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28838 (or 28835 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 18894663 is about 4346.7991672034. The cubic root of 18894663 is about 266.3461254446.

The spelling of 18894663 in words is "eighteen million, eight hundred ninety-four thousand, six hundred sixty-three".