18026 has 4 divisors (see below), whose sum is σ = 27042. Its totient is φ = 9012.

The previous prime is 18013. The next prime is 18041. The reversal of 18026 is 62081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15625 + 2401 = 125^2 + 49^2 .

It is a plaindrome in base 16.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 17995 and 18013.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4505 + ... + 4508.

2¹⁸⁰²⁶ is an apocalyptic number.

18026 is a deficient number, since it is larger than the sum of its proper divisors (9016).

18026 is an equidigital number, since it uses as much as digits as its factorization.

18026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9015.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 18026 is about 134.2609399639. The cubic root of 18026 is about 26.2200262559.

The spelling of 18026 in words is "eighteen thousand, twenty-six".