2051865 has 16 divisors (see below), whose sum is σ = 3648000. Its totient is φ = 1094256.

The previous prime is 2051851. The next prime is 2051887. The reversal of 2051865 is 5681502.

It is not a de Polignac number, because 2051865 - 2⁶ = 2051801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7465 + ... + 7734.

It is an arithmetic number, because the mean of its divisors is an integer number (228000).

2^2051865 is an apocalyptic number.

It is an amenable number.

2051865 is a deficient number, since it is larger than the sum of its proper divisors (1596135).

2051865 is a wasteful number, since it uses less digits than its factorization.

2051865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15213 (or 15207 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2051865 is about 1432.4332445179. The cubic root of 2051865 is about 127.0719207405.

It can be divided in two parts, 2051 and 865, that added together give a square (2916 = 54²).

The spelling of 2051865 in words is "two million, fifty-one thousand, eight hundred sixty-five".