18288218 has 8 divisors (see below), whose sum is σ = 29542548. Its totient is φ = 8440704.

The previous prime is 18288211. The next prime is 18288247. The reversal of 18288218 is 81288281.

It can be written as a sum of positive squares in 2 ways, for example, as 17447329 + 840889 = 4177^2 + 917^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18288211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351671 + ... + 351722.

Almost surely, 2^18288218 is an apocalyptic number.

18288218 is a deficient number, since it is larger than the sum of its proper divisors (11254330).

18288218 is a wasteful number, since it uses less digits than its factorization.

18288218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703408.

The product of its digits is 16384, while the sum is 38.

The square root of 18288218 is about 4276.4726118613. The cubic root of 18288218 is about 263.4655260371.

The spelling of 18288218 in words is "eighteen million, two hundred eighty-eight thousand, two hundred eighteen".