18180005 has 16 divisors (see below), whose sum is σ = 22982400. Its totient is φ = 13778688.

The previous prime is 18179983. The next prime is 18180059. The reversal of 18180005 is 50008181.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18180005 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

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, 12296 + ... + 13694.

It is an arithmetic number, because the mean of its divisors is an integer number (1436400).

Almost surely, 2^18180005 is an apocalyptic number.

It is an amenable number.

18180005 is a deficient number, since it is larger than the sum of its proper divisors (4802395).

18180005 is a wasteful number, since it uses less digits than its factorization.

18180005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 18180005 is about 4263.8017073968. The cubic root of 18180005 is about 262.9448481268.

Adding to 18180005 its reverse (50008181), we get a palindrome (68188186).

The spelling of 18180005 in words is "eighteen million, one hundred eighty thousand, five".