18086224 has 40 divisors (see below), whose sum is σ = 38200680. Its totient is φ = 8245248.

The previous prime is 18086221. The next prime is 18086251. The reversal of 18086224 is 42268081.

It can be written as a sum of positive squares in 4 ways, for example, as 1537600 + 16548624 = 1240^2 + 4068^2 .

It is a super-2 number, since 2×18086224² = 654222997156352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18086221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18024 + ... + 19000.

It is an arithmetic number, because the mean of its divisors is an integer number (955017).

Almost surely, 2^18086224 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 18086224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19100340).

18086224 is an abundant number, since it is smaller than the sum of its proper divisors (20114456).

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

18086224 is a wasteful number, since it uses less digits than its factorization.

18086224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087 (or 1081 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 18086224 is about 4252.7901429532. The cubic root of 18086224 is about 262.4919374697.

The spelling of 18086224 in words is "eighteen million, eighty-six thousand, two hundred twenty-four".