18328091 has 6 divisors (see below), whose sum is σ = 19469940. Its totient is φ = 17249696.

The previous prime is 18328069. The next prime is 18328097. The reversal of 18328091 is 19082381.

It is not a de Polignac number, because 18328091 - 2²² = 14133787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18328097) 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 5 ways as a sum of consecutive naturals, for example, 31421 + ... + 31998.

It is an arithmetic number, because the mean of its divisors is an integer number (3244990).

Almost surely, 2^18328091 is an apocalyptic number.

18328091 is a deficient number, since it is larger than the sum of its proper divisors (1141849).

18328091 is an equidigital number, since it uses as much as digits as its factorization.

18328091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63453 (or 63436 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 18328091 is about 4281.1319764754. The cubic root of 18328091 is about 263.6568611635.

The spelling of 18328091 in words is "eighteen million, three hundred twenty-eight thousand, ninety-one".