18305505 has 12 divisors (see below), whose sum is σ = 31729620. Its totient is φ = 9762912.

The previous prime is 18305479. The next prime is 18305527. The reversal of 18305505 is 50550381.

It can be written as a sum of positive squares in 2 ways, for example, as 3651921 + 14653584 = 1911^2 + 3828^2 .

It is not a de Polignac number, because 18305505 - 2¹¹ = 18303457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203350 + ... + 203439.

It is an arithmetic number, because the mean of its divisors is an integer number (2644135).

Almost surely, 2^18305505 is an apocalyptic number.

18305505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18305505 is a deficient number, since it is larger than the sum of its proper divisors (13424115).

18305505 is a wasteful number, since it uses less digits than its factorization.

18305505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406800 (or 406797 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 18305505 is about 4278.4933095659. The cubic root of 18305505 is about 263.5485137880.

Adding to 18305505 its reverse (50550381), we get a palindrome (68855886).

The spelling of 18305505 in words is "eighteen million, three hundred five thousand, five hundred five".