2805440 has 56 divisors (see below), whose sum is σ = 7296912. Its totient is φ = 1018880.

The previous prime is 2805403. The next prime is 2805443. The reversal of 2805440 is 445082.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2805443) 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, 3122 + ... + 3918.

It is an arithmetic number, because the mean of its divisors is an integer number (130302).

2^2805440 is an apocalyptic number.

2805440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2805440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3648456).

2805440 is an abundant number, since it is smaller than the sum of its proper divisors (4491472).

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

2805440 is a wasteful number, since it uses less digits than its factorization.

2805440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 2805440 is about 1674.9447752090. The cubic root of 2805440 is about 141.0371948887.

The spelling of 2805440 in words is "two million, eight hundred five thousand, four hundred forty".