18005418 has 24 divisors (see below), whose sum is σ = 39843648. Its totient is φ = 5873832.

The previous prime is 18005411. The next prime is 18005419. The reversal of 18005418 is 81450081.

It is a junction number, because it is equal to n+sod(n) for n = 18005391 and 18005400.

It is not an unprimeable number, because it can be changed into a prime (18005411) 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 11 ways as a sum of consecutive naturals, for example, 9796 + ... + 11487.

It is an arithmetic number, because the mean of its divisors is an integer number (1660152).

Almost surely, 2^18005418 is an apocalyptic number.

18005418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18005418 is an abundant number, since it is smaller than the sum of its proper divisors (21838230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18005418 is a wasteful number, since it uses less digits than its factorization.

18005418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21338 (or 21335 counting only the distinct ones).

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

The square root of 18005418 is about 4243.2791565015. The cubic root of 18005418 is about 262.1004315551.

Adding to 18005418 its reverse (81450081), we get a palindrome (99455499).

The spelling of 18005418 in words is "eighteen million, five thousand, four hundred eighteen".