18418005 has 12 divisors (see below), whose sum is σ = 31924620. Its totient is φ = 9822912.

The previous prime is 18418003. The next prime is 18418019. The reversal of 18418005 is 50081481.

It can be written as a sum of positive squares in 2 ways, for example, as 9036036 + 9381969 = 3006^2 + 3063^2 .

It is not a de Polignac number, because 18418005 - 2¹ = 18418003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18418005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204600 + ... + 204689.

It is an arithmetic number, because the mean of its divisors is an integer number (2660385).

Almost surely, 2^18418005 is an apocalyptic number.

18418005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18418005 is a deficient number, since it is larger than the sum of its proper divisors (13506615).

18418005 is a wasteful number, since it uses less digits than its factorization.

18418005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409300 (or 409297 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18418005 is about 4291.6203233744. The cubic root of 18418005 is about 264.0873075558.

Adding to 18418005 its reverse (50081481), we get a palindrome (68499486).

The spelling of 18418005 in words is "eighteen million, four hundred eighteen thousand, five".