18308836 has 48 divisors (see below), whose sum is σ = 39795840. Its totient is φ = 7176960.

The previous prime is 18308833. The next prime is 18308863. The reversal of 18308836 is 63880381.

It is a junction number, because it is equal to n+sod(n) for n = 18308795 and 18308804.

It is not an unprimeable number, because it can be changed into a prime (18308833) 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, 65016 + ... + 65296.

It is an arithmetic number, because the mean of its divisors is an integer number (829080).

Almost surely, 2^18308836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18308836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19897920).

18308836 is an abundant number, since it is smaller than the sum of its proper divisors (21487004).

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

18308836 is a wasteful number, since it uses less digits than its factorization.

18308836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 482 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 18308836 is about 4278.8825644086. The cubic root of 18308836 is about 263.5644985397.

The spelling of 18308836 in words is "eighteen million, three hundred eight thousand, eight hundred thirty-six".