18382840 has 96 divisors (see below), whose sum is σ = 49124880. Its totient is φ = 6171648.

The previous prime is 18382829. The next prime is 18382841. The reversal of 18382840 is 4828381.

It is a junction number, because it is equal to n+sod(n) for n = 18382796 and 18382805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18382841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162624 + ... + 162736.

Almost surely, 2^18382840 is an apocalyptic number.

18382840 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 18382840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24562440).

18382840 is an abundant number, since it is smaller than the sum of its proper divisors (30742040).

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

18382840 is a wasteful number, since it uses less digits than its factorization.

18382840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 18382840 is about 4287.5214285179. The cubic root of 18382840 is about 263.9191288871.

The spelling of 18382840 in words is "eighteen million, three hundred eighty-two thousand, eight hundred forty".