18522018 has 12 divisors (see below), whose sum is σ = 40131078. Its totient is φ = 6174000.

The previous prime is 18522013. The next prime is 18522019. The reversal of 18522018 is 81022581.

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 603729 = 4233^2 + 777^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18521982 and 18522000.

It is not an unprimeable number, because it can be changed into a prime (18522011) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 514483 + ... + 514518.

Almost surely, 2^18522018 is an apocalyptic number.

18522018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18522018 is an abundant number, since it is smaller than the sum of its proper divisors (21609060).

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

18522018 is a wasteful number, since it uses less digits than its factorization.

18522018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029009 (or 1029006 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18522018 is about 4303.7214129170. The cubic root of 18522018 is about 264.5835061868.

Adding to 18522018 its reverse (81022581), we get a palindrome (99544599).

The spelling of 18522018 in words is "eighteen million, five hundred twenty-two thousand, eighteen".