2811904 has 24 divisors (see below), whose sum is σ = 5626530. Its totient is φ = 1404928.

The previous prime is 2811883. The next prime is 2811931. The reversal of 2811904 is 4091182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1557504 + 1254400 = 1248^2 + 1120^2 .

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 as a sum of consecutive naturals, namely, 1362 + ... + 2734.

2^2811904 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 2811904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2813265).

2811904 is an abundant number, since it is smaller than the sum of its proper divisors (2814626).

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

2811904 is an equidigital number, since it uses as much as digits as its factorization.

2811904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395 (or 1375 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 2811904 is about 1676.8732808415. The cubic root of 2811904 is about 141.1454328282.

The spelling of 2811904 in words is "two million, eight hundred eleven thousand, nine hundred four".