18073321 has 8 divisors (see below), whose sum is σ = 20681024. Its totient is φ = 15472080.

The previous prime is 18073309. The next prime is 18073327. The reversal of 18073321 is 12337081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18073321 - 2⁹ = 18072809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18073327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9511 + ... + 11251.

It is an arithmetic number, because the mean of its divisors is an integer number (2585128).

Almost surely, 2^18073321 is an apocalyptic number.

It is an amenable number.

18073321 is a deficient number, since it is larger than the sum of its proper divisors (2607703).

18073321 is a wasteful number, since it uses less digits than its factorization.

18073321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 18073321 is about 4251.2728682125. The cubic root of 18073321 is about 262.4295006445.

The spelling of 18073321 in words is "eighteen million, seventy-three thousand, three hundred twenty-one".