18386944 has 39 divisors (see below), whose sum is σ = 37326387. Its totient is φ = 9056256.

The previous prime is 18386923. The next prime is 18386947. The reversal of 18386944 is 44968381.

The square root of 18386944 is 4288.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18386944.

It is not an unprimeable number, because it can be changed into a prime (18386947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 274399 + ... + 274465.

Almost surely, 2^18386944 is an apocalyptic number.

18386944 is the 4288-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18386944

18386944 is an abundant number, since it is smaller than the sum of its proper divisors (18939443).

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

18386944 is an frugal number, since it uses more digits than its factorization.

18386944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 69 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The cubic root of 18386944 is about 263.9387675557.

The spelling of 18386944 in words is "eighteen million, three hundred eighty-six thousand, nine hundred forty-four".