18028187 has 4 divisors (see below), whose sum is σ = 18036720. Its totient is φ = 18019656.

The previous prime is 18028147. The next prime is 18028189. The reversal of 18028187 is 78182081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18028187 - 2¹² = 18024091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18028189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1514 + ... + 6192.

It is an arithmetic number, because the mean of its divisors is an integer number (4509180).

Almost surely, 2^18028187 is an apocalyptic number.

18028187 is a deficient number, since it is larger than the sum of its proper divisors (8533).

18028187 is an equidigital number, since it uses as much as digits as its factorization.

18028187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8532.

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 18028187 is about 4245.9612574775. The cubic root of 18028187 is about 262.2108659246.

The spelling of 18028187 in words is "eighteen million, twenty-eight thousand, one hundred eighty-seven".