18316440 has 96 divisors (see below), whose sum is σ = 60343920. Its totient is φ = 4817664.

The previous prime is 18316439. The next prime is 18316453. The reversal of 18316440 is 4461381.

18316440 is a `hidden beast` number, since 18 + 3 + 1 + 644 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29574 + ... + 30186.

Almost surely, 2^18316440 is an apocalyptic number.

18316440 is a gapful number since it is divisible by the number (10) 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 18316440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30171960).

18316440 is an abundant number, since it is smaller than the sum of its proper divisors (42027480).

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

18316440 is a wasteful number, since it uses less digits than its factorization.

18316440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 18316440 is about 4279.7710219123. The cubic root of 18316440 is about 263.6009812351.

The spelling of 18316440 in words is "eighteen million, three hundred sixteen thousand, four hundred forty".