18487 has 8 divisors (see below), whose sum is σ = 22400. Its totient is φ = 14904.

The previous prime is 18481. The next prime is 18493. The reversal of 18487 is 78481.

18487 = 3³ + 4³ + ... + 16³.

18487 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (18481) and next prime (18493).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18487 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64 + ... + 202.

It is an arithmetic number, because the mean of its divisors is an integer number (2800).

2¹⁸⁴⁸⁷ is an apocalyptic number.

18487 is the 79-th hex number.

18487 is a deficient number, since it is larger than the sum of its proper divisors (3913).

18487 is a wasteful number, since it uses less digits than its factorization.

18487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165.

The product of its digits is 1792, while the sum is 28.

The square root of 18487 is about 135.9669077386. The cubic root of 18487 is about 26.4416659170.

It can be divided in two parts, 18 and 487, that added together give a palindrome (505).

The spelling of 18487 in words is "eighteen thousand, four hundred eighty-seven".