18263982 has 32 divisors (see below), whose sum is σ = 40195584. Its totient is φ = 5532120.

The previous prime is 18263963. The next prime is 18263989. The reversal of 18263982 is 28936281.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18263982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18263989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6843 + ... + 9129.

It is an arithmetic number, because the mean of its divisors is an integer number (1256112).

Almost surely, 2^18263982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18263982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20097792).

18263982 is an abundant number, since it is smaller than the sum of its proper divisors (21931602).

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

18263982 is a wasteful number, since it uses less digits than its factorization.

18263982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325 (or 2303 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 18263982 is about 4273.6380286590. The cubic root of 18263982 is about 263.3490909049.

The spelling of 18263982 in words is "eighteen million, two hundred sixty-three thousand, nine hundred eighty-two".