2130804 has 72 divisors (see below), whose sum is σ = 6038760. Its totient is φ = 628992.

The previous prime is 2130803. The next prime is 2130809. The reversal of 2130804 is 4080312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22500 + 2108304 = 150^2 + 1452^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2130803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13494 + ... + 13650.

2^2130804 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 2130804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3019380).

2130804 is an abundant number, since it is smaller than the sum of its proper divisors (3907956).

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

2130804 is a wasteful number, since it uses less digits than its factorization.

2130804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2130804 is about 1459.7273718061. The cubic root of 2130804 is about 128.6810219008.

The spelling of 2130804 in words is "two million, one hundred thirty thousand, eight hundred four".