18448218 has 12 divisors (see below), whose sum is σ = 39971178. Its totient is φ = 6149400.

The previous prime is 18448211. The next prime is 18448223. The reversal of 18448218 is 81284481.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17413929 + 1034289 = 4173^2 + 1017^2 .

It is not an unprimeable number, because it can be changed into a prime (18448211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 512433 + ... + 512468.

Almost surely, 2^18448218 is an apocalyptic number.

18448218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18448218 is an abundant number, since it is smaller than the sum of its proper divisors (21522960).

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

18448218 is a wasteful number, since it uses less digits than its factorization.

18448218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024909 (or 1024906 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 18448218 is about 4295.1388801761. The cubic root of 18448218 is about 264.2316321073.

The spelling of 18448218 in words is "eighteen million, four hundred forty-eight thousand, two hundred eighteen".