18280005 has 16 divisors (see below), whose sum is σ = 30257280. Its totient is φ = 9412928.

The previous prime is 18279997. The next prime is 18280007. The reversal of 18280005 is 50008281.

It is a cyclic number.

It is not a de Polignac number, because 18280005 - 2³ = 18279997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18280007) 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 15 ways as a sum of consecutive naturals, for example, 20577 + ... + 21446.

It is an arithmetic number, because the mean of its divisors is an integer number (1891080).

Almost surely, 2^18280005 is an apocalyptic number.

18280005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18280005 is a deficient number, since it is larger than the sum of its proper divisors (11977275).

18280005 is a wasteful number, since it uses less digits than its factorization.

18280005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42060.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 18280005 is about 4275.5122500117. The cubic root of 18280005 is about 263.4260804887.

Adding to 18280005 its reverse (50008281), we get a palindrome (68288286).

The spelling of 18280005 in words is "eighteen million, two hundred eighty thousand, five".