2840840 has 64 divisors (see below), whose sum is σ = 6912000. Its totient is φ = 1048320.

The previous prime is 2840801. The next prime is 2840857. The reversal of 2840840 is 480482.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35921 + ... + 35999.

It is an arithmetic number, because the mean of its divisors is an integer number (108000).

2^2840840 is an apocalyptic number.

2840840 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 2840840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3456000).

2840840 is an abundant number, since it is smaller than the sum of its proper divisors (4071160).

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

2840840 is a wasteful number, since it uses less digits than its factorization.

2840840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 2840840 is about 1685.4791603577. The cubic root of 2840840 is about 141.6279355866.

The spelling of 2840840 in words is "two million, eight hundred forty thousand, eight hundred forty".