18036321 has 8 divisors (see below), whose sum is σ = 24175104. Its totient is φ = 11960880.

The previous prime is 18036311. The next prime is 18036323. The reversal of 18036321 is 12363081.

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

It is not a de Polignac number, because 18036321 - 2²¹ = 15939169 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18036291 and 18036300.

It is not an unprimeable number, because it can be changed into a prime (18036323) 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 7 ways as a sum of consecutive naturals, for example, 15166 + ... + 16311.

It is an arithmetic number, because the mean of its divisors is an integer number (3021888).

Almost surely, 2^18036321 is an apocalyptic number.

It is an amenable number.

18036321 is a deficient number, since it is larger than the sum of its proper divisors (6138783).

18036321 is a wasteful number, since it uses less digits than its factorization.

18036321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31671.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 18036321 is about 4246.9190008758. The cubic root of 18036321 is about 262.2502949679.

The spelling of 18036321 in words is "eighteen million, thirty-six thousand, three hundred twenty-one".