18205418 has 32 divisors (see below), whose sum is σ = 34363008. Its totient is φ = 7085760.

The previous prime is 18205399. The next prime is 18205423. The reversal of 18205418 is 81450281.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18146 + ... + 19122.

It is an arithmetic number, because the mean of its divisors is an integer number (1073844).

Almost surely, 2^18205418 is an apocalyptic number.

18205418 is a deficient number, since it is larger than the sum of its proper divisors (16157590).

18205418 is an equidigital number, since it uses as much as digits as its factorization.

18205418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019 (or 997 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 18205418 is about 4266.7807536830. The cubic root of 18205418 is about 263.0673106206.

Adding to 18205418 its reverse (81450281), we get a palindrome (99655699).

The spelling of 18205418 in words is "eighteen million, two hundred five thousand, four hundred eighteen".