2066689 has 4 divisors (see below), whose sum is σ = 2072020. Its totient is φ = 2061360.

The previous prime is 2066683. The next prime is 2066693. The reversal of 2066689 is 9866602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9866602 = 2 ⋅4933301.

It can be written as a sum of positive squares in 2 ways, for example, as 1016064 + 1050625 = 1008^2 + 1025^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066689 - 2³ = 2066681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2066681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2034 + ... + 2875.

It is an arithmetic number, because the mean of its divisors is an integer number (518005).

2^2066689 is an apocalyptic number.

It is an amenable number.

2066689 is a deficient number, since it is larger than the sum of its proper divisors (5331).

2066689 is an equidigital number, since it uses as much as digits as its factorization.

2066689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 2066689 is about 1437.5983444620. The cubic root of 2066689 is about 127.3772033141.

The spelling of 2066689 in words is "two million, sixty-six thousand, six hundred eighty-nine".