18086321 has 8 divisors (see below), whose sum is σ = 19764864. Its totient is φ = 16413520.

The previous prime is 18086279. The next prime is 18086357. The reversal of 18086321 is 12368081.

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 18086321 - 2²² = 13892017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18086021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7736 + ... + 9798.

It is an arithmetic number, because the mean of its divisors is an integer number (2470608).

Almost surely, 2^18086321 is an apocalyptic number.

18086321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18086321 is a deficient number, since it is larger than the sum of its proper divisors (1678543).

18086321 is a wasteful number, since it uses less digits than its factorization.

18086321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18086321 is about 4252.8015472157. The cubic root of 18086321 is about 262.4924067342.

The spelling of 18086321 in words is "eighteen million, eighty-six thousand, three hundred twenty-one".