18387396 has 72 divisors (see below), whose sum is σ = 49533120. Its totient is φ = 5738304.

The previous prime is 18387377. The next prime is 18387403. The reversal of 18387396 is 69378381.

It is a happy number.

18387396 is a `hidden beast` number, since 183 + 87 + 396 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43675 + ... + 44093.

It is an arithmetic number, because the mean of its divisors is an integer number (687960).

Almost surely, 2^18387396 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 18387396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24766560).

18387396 is an abundant number, since it is smaller than the sum of its proper divisors (31145724).

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

18387396 is a wasteful number, since it uses less digits than its factorization.

18387396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 500 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 18387396 is about 4288.0527049000. The cubic root of 18387396 is about 263.9409303104.

The spelling of 18387396 in words is "eighteen million, three hundred eighty-seven thousand, three hundred ninety-six".