18118408 has 64 divisors (see below), whose sum is σ = 43084800. Its totient is φ = 6937920.

The previous prime is 18118367. The next prime is 18118469. The reversal of 18118408 is 80481181.

It is a self number, because there is not a number n which added to its sum of digits gives 18118408.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41053 + ... + 41491.

It is an arithmetic number, because the mean of its divisors is an integer number (673200).

Almost surely, 2^18118408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18118408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21542400).

18118408 is an abundant number, since it is smaller than the sum of its proper divisors (24966392).

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

18118408 is a wasteful number, since it uses less digits than its factorization.

18118408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 18118408 is about 4256.5723299387. The cubic root of 18118408 is about 262.6475445666.

Adding to 18118408 its reverse (80481181), we get a palindrome (98599589).

The spelling of 18118408 in words is "eighteen million, one hundred eighteen thousand, four hundred eight".