18225636 has 144 divisors (see below), whose sum is σ = 54109440. Its totient is φ = 4717440.

The previous prime is 18225611. The next prime is 18225653. The reversal of 18225636 is 63652281.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 18225597 and 18225606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 423831 + ... + 423873.

It is an arithmetic number, because the mean of its divisors is an integer number (375760).

Almost surely, 2^18225636 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 18225636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27054720).

18225636 is an abundant number, since it is smaller than the sum of its proper divisors (35883804).

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

18225636 is a wasteful number, since it uses less digits than its factorization.

18225636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 91 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 18225636 is about 4269.1493297846. The cubic root of 18225636 is about 263.1646575974.

The spelling of 18225636 in words is "eighteen million, two hundred twenty-five thousand, six hundred thirty-six".