18387864387 has 12 divisors (see below), whose sum is σ = 26763000264. Its totient is φ = 12164998560.

The previous prime is 18387864373. The next prime is 18387864389. The reversal of 18387864387 is 78346878381.

18387864387 is a `hidden beast` number, since 183 + 8 + 78 + 6 + 4 + 387 = 666.

It is not a de Polignac number, because 18387864387 - 2⁴ = 18387864371 is a prime.

It is a super-2 number, since 2×18387864387² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18387864389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7796898 + ... + 7799255.

It is an arithmetic number, because the mean of its divisors is an integer number (2230250022).

Almost surely, 2^18387864387 is an apocalyptic number.

18387864387 is a deficient number, since it is larger than the sum of its proper divisors (8375135877).

18387864387 is a wasteful number, since it uses less digits than its factorization.

18387864387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15596290 (or 15596287 counting only the distinct ones).

The product of its digits is 43352064, while the sum is 63.

The spelling of 18387864387 in words is "eighteen billion, three hundred eighty-seven million, eight hundred sixty-four thousand, three hundred eighty-seven".