2157184 has 32 divisors (see below), whose sum is σ = 4528800. Its totient is φ = 1020672.

The previous prime is 2157173. The next prime is 2157187. The reversal of 2157184 is 4817512.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (2157187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1989 + ... + 2875.

It is an arithmetic number, because the mean of its divisors is an integer number (141525).

2^2157184 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 2157184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2264400).

2157184 is an abundant number, since it is smaller than the sum of its proper divisors (2371616).

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

2157184 is an equidigital number, since it uses as much as digits as its factorization.

2157184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920 (or 908 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 2157184 is about 1468.7355105668. The cubic root of 2157184 is about 129.2098820827.

The spelling of 2157184 in words is "two million, one hundred fifty-seven thousand, one hundred eighty-four".