18270018 has 48 divisors (see below), whose sum is σ = 42981120. Its totient is φ = 5575392.

The previous prime is 18270013. The next prime is 18270023. The reversal of 18270018 is 81007281.

It is an interprime number because it is at equal distance from previous prime (18270013) and next prime (18270023).

It is a junction number, because it is equal to n+sod(n) for n = 18269973 and 18270000.

It is not an unprimeable number, because it can be changed into a prime (18270013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37903 + ... + 38381.

It is an arithmetic number, because the mean of its divisors is an integer number (895440).

Almost surely, 2^18270018 is an apocalyptic number.

18270018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18270018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21490560).

18270018 is an abundant number, since it is smaller than the sum of its proper divisors (24711102).

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

18270018 is a wasteful number, since it uses less digits than its factorization.

18270018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 18270018 is about 4274.3441602192. The cubic root of 18270018 is about 263.3780988185.

Adding to 18270018 its reverse (81007281), we get a palindrome (99277299).

The spelling of 18270018 in words is "eighteen million, two hundred seventy thousand, eighteen".