18028161 has 12 divisors (see below), whose sum is σ = 26229840. Its totient is φ = 11931480.

The previous prime is 18028147. The next prime is 18028189. The reversal of 18028161 is 16182081.

It is not a de Polignac number, because 18028161 - 2⁶ = 18028097 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18028121) 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, 5955 + ... + 8456.

It is an arithmetic number, because the mean of its divisors is an integer number (2185820).

Almost surely, 2^18028161 is an apocalyptic number.

It is an amenable number.

18028161 is a deficient number, since it is larger than the sum of its proper divisors (8201679).

18028161 is a wasteful number, since it uses less digits than its factorization.

18028161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14556 (or 14553 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 18028161 is about 4245.9581957433. The cubic root of 18028161 is about 262.2107398722.

The spelling of 18028161 in words is "eighteen million, twenty-eight thousand, one hundred sixty-one".