2042865 has 24 divisors (see below), whose sum is σ = 3863808. Its totient is φ = 990240.

The previous prime is 2042863. The next prime is 2042891. The reversal of 2042865 is 5682402.

It is not a de Polignac number, because 2042865 - 2¹ = 2042863 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2042863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1569 + ... + 2558.

It is an arithmetic number, because the mean of its divisors is an integer number (160992).

2^2042865 is an apocalyptic number.

It is an amenable number.

2042865 is a deficient number, since it is larger than the sum of its proper divisors (1820943).

2042865 is a wasteful number, since it uses less digits than its factorization.

2042865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4149 (or 4146 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 2042865 is about 1429.2882844269. The cubic root of 2042865 is about 126.8858585512.

The spelling of 2042865 in words is "two million, forty-two thousand, eight hundred sixty-five".