18408005 has 32 divisors (see below), whose sum is σ = 27820800. Its totient is φ = 11358720.

The previous prime is 18408001. The next prime is 18408023. The reversal of 18408005 is 50080481.

It is not a de Polignac number, because 18408005 - 2² = 18408001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18408001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52571 + ... + 52919.

It is an arithmetic number, because the mean of its divisors is an integer number (869400).

Almost surely, 2^18408005 is an apocalyptic number.

It is an amenable number.

18408005 is a deficient number, since it is larger than the sum of its proper divisors (9412795).

18408005 is a wasteful number, since it uses less digits than its factorization.

18408005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 18408005 is about 4290.4551040653. The cubic root of 18408005 is about 264.0395037687.

Adding to 18408005 its reverse (50080481), we get a palindrome (68488486).

The spelling of 18408005 in words is "eighteen million, four hundred eight thousand, five".