18076321 has 16 divisors (see below), whose sum is σ = 20248704. Its totient is φ = 16048384.

The previous prime is 18076319. The next prime is 18076327. The reversal of 18076321 is 12367081.

It is a cyclic number.

It is not a de Polignac number, because 18076321 - 2¹ = 18076319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18076321.

It is not an unprimeable number, because it can be changed into a prime (18076327) 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 15 ways as a sum of consecutive naturals, for example, 32175 + ... + 32731.

It is an arithmetic number, because the mean of its divisors is an integer number (1265544).

Almost surely, 2^18076321 is an apocalyptic number.

It is an amenable number.

18076321 is a deficient number, since it is larger than the sum of its proper divisors (2172383).

18076321 is a wasteful number, since it uses less digits than its factorization.

18076321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 18076321 is about 4251.6256890747. The cubic root of 18076321 is about 262.4440201111. Note that the first 3 decimals are identical.

It can be divided in two parts, 1807 and 6321, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 18076321 in words is "eighteen million, seventy-six thousand, three hundred twenty-one".