2066709 has 16 divisors (see below), whose sum is σ = 2902592. Its totient is φ = 1306368.

The previous prime is 2066699. The next prime is 2066717. The reversal of 2066709 is 9076602.

It is not a de Polignac number, because 2066709 - 2⁴ = 2066693 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2066759) by changing a digit.

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, 4557 + ... + 4989.

It is an arithmetic number, because the mean of its divisors is an integer number (181412).

2^2066709 is an apocalyptic number.

It is an amenable number.

2066709 is a deficient number, since it is larger than the sum of its proper divisors (835883).

2066709 is a wasteful number, since it uses less digits than its factorization.

2066709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 2066709 is about 1437.6053004911. The cubic root of 2066709 is about 127.3776142025.

It can be divided in two parts, 2066 and 709, that added together give a triangular number (2775 = T₇₄).

The spelling of 2066709 in words is "two million, sixty-six thousand, seven hundred nine".