18006224 has 40 divisors (see below), whose sum is σ = 37363680. Its totient is φ = 8380800.

The previous prime is 18006221. The next prime is 18006227. The reversal of 18006224 is 42260081.

It is an interprime number because it is at equal distance from previous prime (18006221) and next prime (18006227).

It is a self number, because there is not a number n which added to its sum of digits gives 18006224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18006221) 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, 18059 + ... + 19029.

It is an arithmetic number, because the mean of its divisors is an integer number (934092).

Almost surely, 2^18006224 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 18006224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18681840).

18006224 is an abundant number, since it is smaller than the sum of its proper divisors (19357456).

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

18006224 is a wasteful number, since it uses less digits than its factorization.

18006224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059 (or 1053 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 18006224 is about 4243.3741291571. The cubic root of 18006224 is about 262.1043424112.

The spelling of 18006224 in words is "eighteen million, six thousand, two hundred twenty-four".