2821440 has 56 divisors (see below), whose sum is σ = 8961120. Its totient is φ = 752128.

The previous prime is 2821421. The next prime is 2821451. The reversal of 2821440 is 441282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510 + ... + 2429.

It is an arithmetic number, because the mean of its divisors is an integer number (160020).

2^2821440 is an apocalyptic number.

2821440 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 2821440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4480560).

2821440 is an abundant number, since it is smaller than the sum of its proper divisors (6139680).

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

2821440 is a wasteful number, since it uses less digits than its factorization.

2821440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959 (or 2949 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 2821440 is about 1679.7142614147. The cubic root of 2821440 is about 141.3048081350.

The spelling of 2821440 in words is "two million, eight hundred twenty-one thousand, four hundred forty".