18012618 has 48 divisors (see below), whose sum is σ = 43601376. Its totient is φ = 5540400.

The previous prime is 18012613. The next prime is 18012647. The reversal of 18012618 is 81621081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18012591 and 18012600.

It is not an unprimeable number, because it can be changed into a prime (18012613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4893 + ... + 7743.

It is an arithmetic number, because the mean of its divisors is an integer number (908362).

Almost surely, 2^18012618 is an apocalyptic number.

18012618 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 18012618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21800688).

18012618 is an abundant number, since it is smaller than the sum of its proper divisors (25588758).

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

18012618 is a wasteful number, since it uses less digits than its factorization.

18012618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881 (or 2869 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 18012618 is about 4244.1274721667. The cubic root of 18012618 is about 262.1353631078.

Adding to 18012618 its reverse (81621081), we get a palindrome (99633699).

The spelling of 18012618 in words is "eighteen million, twelve thousand, six hundred eighteen".