2090865 has 16 divisors (see below), whose sum is σ = 3823488. Its totient is φ = 955776.

The previous prime is 2090863. The next prime is 2090873. The reversal of 2090865 is 5680902.

It is not a de Polignac number, because 2090865 - 2¹ = 2090863 is a prime.

It is an Ulam number.

2090865 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2090863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9852 + ... + 10061.

It is an arithmetic number, because the mean of its divisors is an integer number (238968).

2^2090865 is an apocalyptic number.

It is an amenable number.

2090865 is a deficient number, since it is larger than the sum of its proper divisors (1732623).

2090865 is a wasteful number, since it uses less digits than its factorization.

2090865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19928.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 2090865 is about 1445.9823650377. The cubic root of 2090865 is about 127.8719626255.

The spelling of 2090865 in words is "two million, ninety thousand, eight hundred sixty-five".