18418398 has 16 divisors (see below), whose sum is σ = 36950160. Its totient is φ = 6120576.

The previous prime is 18418373. The next prime is 18418399. The reversal of 18418398 is 89381481.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2533 + ... + 6576.

It is an arithmetic number, because the mean of its divisors is an integer number (2309385).

Almost surely, 2^18418398 is an apocalyptic number.

18418398 is an abundant number, since it is smaller than the sum of its proper divisors (18531762).

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

18418398 is a wasteful number, since it uses less digits than its factorization.

18418398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9451.

The product of its digits is 55296, while the sum is 42.

The square root of 18418398 is about 4291.6661100323. Note that the first 3 decimals coincide. The cubic root of 18418398 is about 264.0891858912.

The spelling of 18418398 in words is "eighteen million, four hundred eighteen thousand, three hundred ninety-eight".