2856840 has 128 divisors (see below), whose sum is σ = 10368000. Its totient is φ = 615168.

The previous prime is 2856823. The next prime is 2856857. The reversal of 2856840 is 486582.

2856840 is digitally balanced in base 2 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2856823) and next prime (2856857).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15871 + ... + 16049.

It is an arithmetic number, because the mean of its divisors is an integer number (81000).

2^2856840 is an apocalyptic number.

2856840 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 2856840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5184000).

2856840 is an abundant number, since it is smaller than the sum of its proper divisors (7511160).

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

2856840 is a wasteful number, since it uses less digits than its factorization.

2856840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 2856840 is about 1690.2189207319. The cubic root of 2856840 is about 141.8933272785.

The spelling of 2856840 in words is "two million, eight hundred fifty-six thousand, eight hundred forty".