2181304 has 32 divisors (see below), whose sum is σ = 4443120. Its totient is φ = 999936.

The previous prime is 2181271. The next prime is 2181329. The reversal of 2181304 is 4031812.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5662 + ... + 6034.

2^2181304 is an apocalyptic number.

It is an amenable number.

2181304 is an abundant number, since it is smaller than the sum of its proper divisors (2261816).

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

2181304 is a wasteful number, since it uses less digits than its factorization.

2181304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2181304 is about 1476.9238301280. The cubic root of 2181304 is about 129.6896740043.

It can be divided in two parts, 2181 and 304, that added together give a triangular number (2485 = T₇₀).

The spelling of 2181304 in words is "two million, one hundred eighty-one thousand, three hundred four".