18002 has 4 divisors (see below), whose sum is σ = 27006. Its totient is φ = 9000.

The previous prime is 17989. The next prime is 18013. The reversal of 18002 is 20081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20081 = 43 ⋅467.

It can be written as a sum of positive squares in only one way, i.e., 17161 + 841 = 131^2 + 29^2 .

It is a plaindrome in base 14.

It is an unprimeable number.

18002 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4499 + ... + 4502.

2¹⁸⁰⁰² is an apocalyptic number.

18002 is a deficient number, since it is larger than the sum of its proper divisors (9004).

18002 is an equidigital number, since it uses as much as digits as its factorization.

18002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9003.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 18002 is about 134.1715320029. The cubic root of 18002 is about 26.2083845511.

Adding to 18002 its reverse (20081), we get a palindrome (38083).

It can be divided in two parts, 1800 and 2, that multiplied together give a square (3600 = 60²).

The spelling of 18002 in words is "eighteen thousand, two".