18268887 has 16 divisors (see below), whose sum is σ = 29980160. Its totient is φ = 9636192.

The previous prime is 18268849. The next prime is 18268891. The reversal of 18268887 is 78886281.

It is not a de Polignac number, because 18268887 - 2¹⁰ = 18267863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18268807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33187 + ... + 33732.

It is an arithmetic number, because the mean of its divisors is an integer number (1873760).

Almost surely, 2^18268887 is an apocalyptic number.

18268887 is a deficient number, since it is larger than the sum of its proper divisors (11711273).

18268887 is a wasteful number, since it uses less digits than its factorization.

18268887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66942.

The product of its digits is 344064, while the sum is 48.

The square root of 18268887 is about 4274.2118571732. The cubic root of 18268887 is about 263.3726639255.

The spelling of 18268887 in words is "eighteen million, two hundred sixty-eight thousand, eight hundred eighty-seven".