18118887 has 16 divisors (see below), whose sum is σ = 24768000. Its totient is φ = 11778624.

The previous prime is 18118861. The next prime is 18118897. The reversal of 18118887 is 78881181.

It is not a de Polignac number, because 18118887 - 2¹⁰ = 18117863 is a prime.

It is a super-2 number, since 2×18118887² = 656588132237538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18118897) 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, 20664 + ... + 21522.

It is an arithmetic number, because the mean of its divisors is an integer number (1548000).

Almost surely, 2^18118887 is an apocalyptic number.

18118887 is a deficient number, since it is larger than the sum of its proper divisors (6649113).

18118887 is an equidigital number, since it uses as much as digits as its factorization.

18118887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030.

The product of its digits is 28672, while the sum is 42.

The square root of 18118887 is about 4256.6285954967. The cubic root of 18118887 is about 262.6498591016.

The spelling of 18118887 in words is "eighteen million, one hundred eighteen thousand, eight hundred eighty-seven".