18025321 has 4 divisors (see below), whose sum is σ = 19085652. Its totient is φ = 16964992.

The previous prime is 18025297. The next prime is 18025333. The reversal of 18025321 is 12352081.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6431296 + 11594025 = 2536^2 + 3405^2 .

It is a cyclic number.

It is not a de Polignac number, because 18025321 - 2¹¹ = 18023273 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18025292 and 18025301.

It is not an unprimeable number, because it can be changed into a prime (18025391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530140 + ... + 530173.

It is an arithmetic number, because the mean of its divisors is an integer number (4771413).

Almost surely, 2^18025321 is an apocalyptic number.

It is an amenable number.

18025321 is a deficient number, since it is larger than the sum of its proper divisors (1060331).

18025321 is a wasteful number, since it uses less digits than its factorization.

18025321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060330.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18025321 is about 4245.6237468716. The cubic root of 18025321 is about 262.1969703478.

The spelling of 18025321 in words is "eighteen million, twenty-five thousand, three hundred twenty-one".