18256224 has 72 divisors (see below), whose sum is σ = 55761048. Its totient is φ = 5214720.

The previous prime is 18256219. The next prime is 18256229. The reversal of 18256224 is 42265281.

It is an interprime number because it is at equal distance from previous prime (18256219) and next prime (18256229).

It is a junction number, because it is equal to n+sod(n) for n = 18256191 and 18256200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18256229) 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, 2764 + ... + 6644.

It is an arithmetic number, because the mean of its divisors is an integer number (774459).

Almost surely, 2^18256224 is an apocalyptic number.

18256224 is a gapful number since it is divisible by the number (14) 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 18256224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27880524).

18256224 is an abundant number, since it is smaller than the sum of its proper divisors (37504824).

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

18256224 is a wasteful number, since it uses less digits than its factorization.

18256224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3908 (or 3893 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 18256224 is about 4272.7302746605. The cubic root of 18256224 is about 263.3117979861.

The spelling of 18256224 in words is "eighteen million, two hundred fifty-six thousand, two hundred twenty-four".