18169984 has 48 divisors (see below), whose sum is σ = 42122430. Its totient is φ = 7784448.

The previous prime is 18169967. The next prime is 18170027. The reversal of 18169984 is 48996181.

It can be written as a sum of positive squares in only one way, i.e., 17640000 + 529984 = 4200^2 + 728^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4824 + ... + 7720.

Almost surely, 2^18169984 is an apocalyptic number.

18169984 is a gapful number since it is divisible by the number (14) 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 18169984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21061215).

18169984 is an abundant number, since it is smaller than the sum of its proper divisors (23952446).

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

18169984 is an equidigital number, since it uses as much as digits as its factorization.

18169984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2925 (or 2906 counting only the distinct ones).

The product of its digits is 124416, while the sum is 46.

The square root of 18169984 is about 4262.6264204127. The cubic root of 18169984 is about 262.8965266400.

The spelling of 18169984 in words is "eighteen million, one hundred sixty-nine thousand, nine hundred eighty-four".