18328985 has 4 divisors (see below), whose sum is σ = 21994788. Its totient is φ = 14663184.

The previous prime is 18328979. The next prime is 18328987. The reversal of 18328985 is 58982381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14280841 + 4048144 = 3779^2 + 2012^2 .

It is a cyclic number.

It is not a de Polignac number, because 18328985 - 2⁴ = 18328969 is a prime.

It is a super-2 number, since 2×18328985² = 671903382260450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18328987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1832894 + ... + 1832903.

It is an arithmetic number, because the mean of its divisors is an integer number (5498697).

Almost surely, 2^18328985 is an apocalyptic number.

It is an amenable number.

18328985 is a deficient number, since it is larger than the sum of its proper divisors (3665803).

18328985 is an equidigital number, since it uses as much as digits as its factorization.

18328985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665802.

The product of its digits is 138240, while the sum is 44.

The square root of 18328985 is about 4281.2363868397. The cubic root of 18328985 is about 263.6611479420.

The spelling of 18328985 in words is "eighteen million, three hundred twenty-eight thousand, nine hundred eighty-five".