18318356 has 36 divisors (see below), whose sum is σ = 39261600. Its totient is φ = 7436016.

The previous prime is 18318347. The next prime is 18318359. The reversal of 18318356 is 65381381.

18318356 = T₈₈ + T₈₉ + ... + T₄₇₉.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18318359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1265 + ... + 6183.

It is an arithmetic number, because the mean of its divisors is an integer number (1090600).

Almost surely, 2^18318356 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 18318356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19630800).

18318356 is an abundant number, since it is smaller than the sum of its proper divisors (20943244).

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

18318356 is a wasteful number, since it uses less digits than its factorization.

18318356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4956 (or 4947 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 18318356 is about 4279.9948598100. The cubic root of 18318356 is about 263.6101722837.

The spelling of 18318356 in words is "eighteen million, three hundred eighteen thousand, three hundred fifty-six".