18443516 has 48 divisors (see below), whose sum is σ = 41470464. Its totient is φ = 6975936.

The previous prime is 18443461. The next prime is 18443531. The reversal of 18443516 is 61534481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7271 + ... + 9473.

It is an arithmetic number, because the mean of its divisors is an integer number (863968).

Almost surely, 2^18443516 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 18443516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20735232).

18443516 is an abundant number, since it is smaller than the sum of its proper divisors (23026948).

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

18443516 is a wasteful number, since it uses less digits than its factorization.

18443516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250 (or 2248 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 18443516 is about 4294.5914823182. The cubic root of 18443516 is about 264.2091814709.

Adding to 18443516 its reverse (61534481), we get a palindrome (79977997).

The spelling of 18443516 in words is "eighteen million, four hundred forty-three thousand, five hundred sixteen".