18657868 has 6 divisors (see below), whose sum is σ = 32651276. Its totient is φ = 9328932.

The previous prime is 18657841. The next prime is 18657869. The reversal of 18657868 is 86875681.

It is not an unprimeable number, because it can be changed into a prime (18657869) 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 as a sum of consecutive naturals, namely, 2332230 + ... + 2332237.

Almost surely, 2^18657868 is an apocalyptic number.

It is an amenable number.

18657868 is a deficient number, since it is larger than the sum of its proper divisors (13993408).

18657868 is a wasteful number, since it uses less digits than its factorization.

18657868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4664471 (or 4664469 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The square root of 18657868 is about 4319.4754311143. The cubic root of 18657868 is about 265.2287949309.

The spelling of 18657868 in words is "eighteen million, six hundred fifty-seven thousand, eight hundred sixty-eight".