18225396 has 72 divisors (see below), whose sum is σ = 54372864. Its totient is φ = 5037120.

The previous prime is 18225371. The next prime is 18225401. The reversal of 18225396 is 69352281.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18225396.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 6646 + ... + 8978.

Almost surely, 2^18225396 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 18225396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27186432).

18225396 is an abundant number, since it is smaller than the sum of its proper divisors (36147468).

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

18225396 is a wasteful number, since it uses less digits than its factorization.

18225396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381 (or 2376 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 18225396 is about 4269.1212210477. The cubic root of 18225396 is about 263.1635024517.

The spelling of 18225396 in words is "eighteen million, two hundred twenty-five thousand, three hundred ninety-six".