2211804 has 72 divisors (see below), whose sum is σ = 6534528. Its totient is φ = 617760.

The previous prime is 2211793. The next prime is 2211817. The reversal of 2211804 is 4081122.

2211804 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16819 + ... + 16949.

2^2211804 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 2211804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3267264).

2211804 is an abundant number, since it is smaller than the sum of its proper divisors (4322724).

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

2211804 is a wasteful number, since it uses less digits than its factorization.

2211804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 2211804 is about 1487.2135018214. The cubic root of 2211804 is about 130.2913387131.

Adding to 2211804 its reverse (4081122), we get a palindrome (6292926).

It can be divided in two parts, 221 and 1804, that added together give a square (2025 = 45²).

The spelling of 2211804 in words is "two million, two hundred eleven thousand, eight hundred four".