18038286 has 48 divisors (see below), whose sum is σ = 44928000. Its totient is φ = 5123664.

The previous prime is 18038281. The next prime is 18038291. The reversal of 18038286 is 68283081.

It is an interprime number because it is at equal distance from previous prime (18038281) and next prime (18038291).

It is a self number, because there is not a number n which added to its sum of digits gives 18038286.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18038281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29815 + ... + 30413.

It is an arithmetic number, because the mean of its divisors is an integer number (936000).

Almost surely, 2^18038286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18038286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22464000).

18038286 is an abundant number, since it is smaller than the sum of its proper divisors (26889714).

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

18038286 is a wasteful number, since it uses less digits than its factorization.

18038286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18038286 is about 4247.1503387566. The cubic root of 18038286 is about 262.2598184015.

The spelling of 18038286 in words is "eighteen million, thirty-eight thousand, two hundred eighty-six".