18003418 has 16 divisors (see below), whose sum is σ = 27638856. Its totient is φ = 8792640.

The previous prime is 18003413. The next prime is 18003449. The reversal of 18003418 is 81430081.

It can be written as a sum of positive squares in 4 ways, for example, as 10067929 + 7935489 = 3173^2 + 2817^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18003392 and 18003401.

It is not an unprimeable number, because it can be changed into a prime (18003413) 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 7 ways as a sum of consecutive naturals, for example, 20680 + ... + 21532.

Almost surely, 2^18003418 is an apocalyptic number.

18003418 is a deficient number, since it is larger than the sum of its proper divisors (9635438).

18003418 is a wasteful number, since it uses less digits than its factorization.

18003418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18003418 is about 4243.0434831616. The cubic root of 18003418 is about 262.0907266934.

Adding to 18003418 its reverse (81430081), we get a palindrome (99433499).

The spelling of 18003418 in words is "eighteen million, three thousand, four hundred eighteen".