2181284 has 36 divisors (see below), whose sum is σ = 4596480. Its totient is φ = 902160.

The previous prime is 2181271. The next prime is 2181329. The reversal of 2181284 is 4821812.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 5897 + ... + 6255.

It is an arithmetic number, because the mean of its divisors is an integer number (127680).

2^2181284 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 2181284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2298240).

2181284 is an abundant number, since it is smaller than the sum of its proper divisors (2415196).

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

2181284 is a wasteful number, since it uses less digits than its factorization.

2181284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 399 counting only the distinct ones).

The product of its digits is 1024, while the sum is 26.

The square root of 2181284 is about 1476.9170592826. The cubic root of 2181284 is about 129.6892776357.

The spelling of 2181284 in words is "two million, one hundred eighty-one thousand, two hundred eighty-four".