2811204 has 72 divisors (see below), whose sum is σ = 8037120. Its totient is φ = 820800.

The previous prime is 2811203. The next prime is 2811209. The reversal of 2811204 is 4021182.

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2811203) 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, 12162 + ... + 12390.

2^2811204 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 2811204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4018560).

2811204 is an abundant number, since it is smaller than the sum of its proper divisors (5225916).

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

2811204 is a wasteful number, since it uses less digits than its factorization.

2811204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 276 counting only the distinct ones).

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

The square root of 2811204 is about 1676.6645460557. The cubic root of 2811204 is about 141.1337195309.

Adding to 2811204 its reverse (4021182), we get a palindrome (6832386).

It can be divided in two parts, 281 and 1204, that added together give a triangular number (1485 = T₅₄).

The spelling of 2811204 in words is "two million, eight hundred eleven thousand, two hundred four".