18118736 has 40 divisors (see below), whose sum is σ = 38468520. Its totient is φ = 8228864.

The previous prime is 18118721. The next prime is 18118777. The reversal of 18118736 is 63781181.

It can be written as a sum of positive squares in 4 ways, for example, as 4752400 + 13366336 = 2180^2 + 3656^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18118696 and 18118705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6740 + ... + 9036.

It is an arithmetic number, because the mean of its divisors is an integer number (961713).

Almost surely, 2^18118736 is an apocalyptic number.

18118736 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 18118736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19234260).

18118736 is an abundant number, since it is smaller than the sum of its proper divisors (20349784).

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

18118736 is a wasteful number, since it uses less digits than its factorization.

18118736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351 (or 2345 counting only the distinct ones).

The product of its digits is 8064, while the sum is 35.

The square root of 18118736 is about 4256.6108584178. The cubic root of 18118736 is about 262.6491294718.

The spelling of 18118736 in words is "eighteen million, one hundred eighteen thousand, seven hundred thirty-six".