18040005 has 24 divisors (see below), whose sum is σ = 31999968. Its totient is φ = 9396576.

The previous prime is 18039997. The next prime is 18040007. The reversal of 18040005 is 50004081.

It is not a de Polignac number, because 18040005 - 2³ = 18039997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18040005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18040007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2727 + ... + 6596.

It is an arithmetic number, because the mean of its divisors is an integer number (1333332).

Almost surely, 2^18040005 is an apocalyptic number.

18040005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18040005 is a deficient number, since it is larger than the sum of its proper divisors (13959963).

18040005 is a wasteful number, since it uses less digits than its factorization.

18040005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9377 (or 9374 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 18040005 is about 4247.3527049210. The cubic root of 18040005 is about 262.2681490213.

Adding to 18040005 its reverse (50004081), we get a palindrome (68044086).

The spelling of 18040005 in words is "eighteen million, forty thousand, five".