2809812 has 24 divisors (see below), whose sum is σ = 6717312. Its totient is φ = 913600.

The previous prime is 2809787. The next prime is 2809813. The reversal of 2809812 is 2189082.

It is a self number, because there is not a number n which added to its sum of digits gives 2809812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2364 + ... + 3347.

It is an arithmetic number, because the mean of its divisors is an integer number (279888).

2^2809812 is an apocalyptic number.

It is an amenable number.

2809812 is an abundant number, since it is smaller than the sum of its proper divisors (3907500).

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

2809812 is a wasteful number, since it uses less digits than its factorization.

2809812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5759 (or 5757 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 2809812 is about 1676.2493847874. The cubic root of 2809812 is about 141.1104210234.

The spelling of 2809812 in words is "two million, eight hundred nine thousand, eight hundred twelve".