16181984 has 48 divisors (see below), whose sum is σ = 39217248. Its totient is φ = 6400512.

The previous prime is 16181981. The next prime is 16181999. The reversal of 16181984 is 48918161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16181981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134 + ... + 5690.

It is an arithmetic number, because the mean of its divisors is an integer number (817026).

Almost surely, 2^16181984 is an apocalyptic number.

16181984 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 16181984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19608624).

16181984 is an abundant number, since it is smaller than the sum of its proper divisors (23035264).

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

16181984 is a wasteful number, since it uses less digits than its factorization.

16181984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5587 (or 5579 counting only the distinct ones).

The product of its digits is 13824, while the sum is 38.

The square root of 16181984 is about 4022.6836813252. The cubic root of 16181984 is about 252.9359667555.

The spelling of 16181984 in words is "sixteen million, one hundred eighty-one thousand, nine hundred eighty-four".