18012918 has 64 divisors (see below), whose sum is σ = 45416448. Its totient is φ = 4626720.

The previous prime is 18012901. The next prime is 18012919. The reversal of 18012918 is 81921081.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58521 + ... + 58827.

It is an arithmetic number, because the mean of its divisors is an integer number (709632).

Almost surely, 2^18012918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18012918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22708224).

18012918 is an abundant number, since it is smaller than the sum of its proper divisors (27403530).

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

18012918 is a wasteful number, since it uses less digits than its factorization.

18012918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 18012918 is about 4244.1628149731. The cubic root of 18012918 is about 262.1368183871.

Adding to 18012918 its reverse (81921081), we get a palindrome (99933999).

The spelling of 18012918 in words is "eighteen million, twelve thousand, nine hundred eighteen".