2861865 has 64 divisors (see below), whose sum is σ = 5702400. Its totient is φ = 1354752.

The previous prime is 2861861. The next prime is 2861869. The reversal of 2861865 is 5681682.

2861865 = 193² + 194² + ... + 250².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2861861) and next prime (2861869).

It is not a de Polignac number, because 2861865 - 2² = 2861861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2861861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66534 + ... + 66576.

It is an arithmetic number, because the mean of its divisors is an integer number (89100).

2^2861865 is an apocalyptic number.

It is an amenable number.

2861865 is a deficient number, since it is larger than the sum of its proper divisors (2840535).

2861865 is a wasteful number, since it uses less digits than its factorization.

2861865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 97 counting only the distinct ones).

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

The square root of 2861865 is about 1691.7047614758. The cubic root of 2861865 is about 141.9764723302.

The spelling of 2861865 in words is "two million, eight hundred sixty-one thousand, eight hundred sixty-five".