18321396 has 48 divisors (see below), whose sum is σ = 45480960. Its totient is φ = 5724000.

The previous prime is 18321389. The next prime is 18321419. The reversal of 18321396 is 69312381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24021 + ... + 24771.

It is an arithmetic number, because the mean of its divisors is an integer number (947520).

Almost surely, 2^18321396 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 18321396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22740480).

18321396 is an abundant number, since it is smaller than the sum of its proper divisors (27159564).

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

18321396 is a wasteful number, since it uses less digits than its factorization.

18321396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884 (or 882 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 18321396 is about 4280.3499856904. The cubic root of 18321396 is about 263.6247538432.

The spelling of 18321396 in words is "eighteen million, three hundred twenty-one thousand, three hundred ninety-six".