2065645 has 4 divisors (see below), whose sum is σ = 2478780. Its totient is φ = 1652512.

The previous prime is 2065639. The next prime is 2065663. The reversal of 2065645 is 5465602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 779689 + 1285956 = 883^2 + 1134^2 .

It is a cyclic number.

It is not a de Polignac number, because 2065645 - 2¹¹ = 2063597 is a prime.

It is a super-3 number, since 3×2065645³ = 26441635433754633375, which contains 333 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 206560 + ... + 206569.

It is an arithmetic number, because the mean of its divisors is an integer number (619695).

2^2065645 is an apocalyptic number.

It is an amenable number.

2065645 is a deficient number, since it is larger than the sum of its proper divisors (413135).

2065645 is an equidigital number, since it uses as much as digits as its factorization.

2065645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413134.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 2065645 is about 1437.2351930008. The cubic root of 2065645 is about 127.3557512558.

The spelling of 2065645 in words is "two million, sixty-five thousand, six hundred forty-five".