18018936 has 192 divisors, whose sum is σ = 58705920. Its totient is φ = 5132160.

The previous prime is 18018911. The next prime is 18018937. The reversal of 18018936 is 63981081.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18018936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18018937) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 581241 + ... + 581271.

It is an arithmetic number, because the mean of its divisors is an integer number (305760).

Almost surely, 2^18018936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18018936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29352960).

18018936 is an abundant number, since it is smaller than the sum of its proper divisors (40686984).

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

18018936 is a wasteful number, since it uses less digits than its factorization.

18018936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18018936 is about 4244.8717295108. The cubic root of 18018936 is about 262.1660078781.

The spelling of 18018936 in words is "eighteen million, eighteen thousand, nine hundred thirty-six".