2865220 has 12 divisors (see below), whose sum is σ = 6017004. Its totient is φ = 1146080.

The previous prime is 2865211. The next prime is 2865241. The reversal of 2865220 is 225682.

It can be written as a sum of positive squares in 2 ways, for example, as 831744 + 2033476 = 912^2 + 1426^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71611 + ... + 71650.

It is an arithmetic number, because the mean of its divisors is an integer number (501417).

2^2865220 is an apocalyptic number.

2865220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2865220 is an abundant number, since it is smaller than the sum of its proper divisors (3151784).

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

2865220 is a wasteful number, since it uses less digits than its factorization.

2865220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143270 (or 143268 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2865220 is about 1692.6960743146. The cubic root of 2865220 is about 142.0319309268.

The spelling of 2865220 in words is "two million, eight hundred sixty-five thousand, two hundred twenty".