2120665 has 16 divisors (see below), whose sum is σ = 2745360. Its totient is φ = 1566720.

The previous prime is 2120653. The next prime is 2120693. The reversal of 2120665 is 5660212.

2120665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 729 + 2119936 = 27^2 + 1456^2 .

It is not a de Polignac number, because 2120665 - 2⁷ = 2120537 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4981 + ... + 5389.

It is an arithmetic number, because the mean of its divisors is an integer number (171585).

2^2120665 is an apocalyptic number.

It is an amenable number.

2120665 is a deficient number, since it is larger than the sum of its proper divisors (624695).

2120665 is a wasteful number, since it uses less digits than its factorization.

2120665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2120665 is about 1456.2503218884. The cubic root of 2120665 is about 128.4765964433.

Adding to 2120665 its reverse (5660212), we get a palindrome (7780877).

The spelling of 2120665 in words is "two million, one hundred twenty thousand, six hundred sixty-five".