18243456 has 128 divisors (see below), whose sum is σ = 60514560. Its totient is φ = 4730880.

The previous prime is 18243451. The next prime is 18243457. The reversal of 18243456 is 65434281.

It is a tau number, because it is divible by the number of its divisors (128).

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

Its product of digits (23040) is a multiple of the sum of its prime divisors (640).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243451) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 29260 + ... + 29876.

It is an arithmetic number, because the mean of its divisors is an integer number (472770).

Almost surely, 2^18243456 is an apocalyptic number.

18243456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18243456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30257280).

18243456 is an abundant number, since it is smaller than the sum of its proper divisors (42271104).

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

18243456 is a wasteful number, since it uses less digits than its factorization.

18243456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652 (or 640 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 18243456 is about 4271.2358867194. The cubic root of 18243456 is about 263.2503988508.

The spelling of 18243456 in words is "eighteen million, two hundred forty-three thousand, four hundred fifty-six".