2865816 has 48 divisors (see below), whose sum is σ = 7918560. Its totient is φ = 936000.

The previous prime is 2865803. The next prime is 2865817. The reversal of 2865816 is 6185682.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2865817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3441 + ... + 4191.

It is an arithmetic number, because the mean of its divisors is an integer number (164970).

2^2865816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2865816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3959280).

2865816 is an abundant number, since it is smaller than the sum of its proper divisors (5052744).

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

2865816 is a wasteful number, since it uses less digits than its factorization.

2865816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 809 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2865816 is about 1692.8721156662. The cubic root of 2865816 is about 142.0417783570.

The spelling of 2865816 in words is "two million, eight hundred sixty-five thousand, eight hundred sixteen".