18118656 has 72 divisors (see below), whose sum is σ = 52383240. Its totient is φ = 6033408.

The previous prime is 18118603. The next prime is 18118657. The reversal of 18118656 is 65681181.

It is a tau number, because it is divible by the number of its divisors (72).

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 18118656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18118657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17941 + ... + 18923.

It is an arithmetic number, because the mean of its divisors is an integer number (727545).

Almost surely, 2^18118656 is an apocalyptic number.

18118656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18118656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26191620).

18118656 is an abundant number, since it is smaller than the sum of its proper divisors (34264584).

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

18118656 is an equidigital number, since it uses as much as digits as its factorization.

18118656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011 (or 988 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 18118656 is about 4256.6014612599. The cubic root of 18118656 is about 262.6487429113.

The spelling of 18118656 in words is "eighteen million, one hundred eighteen thousand, six hundred fifty-six".