2181984 has 96 divisors (see below), whose sum is σ = 6967296. Its totient is φ = 583680.

The previous prime is 2181973. The next prime is 2182007. The reversal of 2181984 is 4891812.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×2181984² = 9522108352512, which contains 22 as substring.

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, 11329 + ... + 11519.

It is an arithmetic number, because the mean of its divisors is an integer number (72576).

2^2181984 is an apocalyptic number.

2181984 is a gapful number since it is divisible by the number (24) 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 2181984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3483648).

2181984 is an abundant number, since it is smaller than the sum of its proper divisors (4785312).

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

2181984 is a wasteful number, since it uses less digits than its factorization.

2181984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 220 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 2181984 is about 1477.1540204055. The cubic root of 2181984 is about 129.7031490962.

The spelling of 2181984 in words is "two million, one hundred eighty-one thousand, nine hundred eighty-four".