2006689 has 2 divisors, whose sum is σ = 2006690. Its totient is φ = 2006688.

The previous prime is 2006677. The next prime is 2006707. The reversal of 2006689 is 9866002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1040400 + 966289 = 1020^2 + 983^2 .

It is a cyclic number.

It is not a de Polignac number, because 2006689 - 2⁵ = 2006657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2006689.

It is not a weakly prime, because it can be changed into another prime (2006659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1003344 + 1003345.

It is an arithmetic number, because the mean of its divisors is an integer number (1003345).

2^2006689 is an apocalyptic number.

It is an amenable number.

2006689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2006689 is an equidigital number, since it uses as much as digits as its factorization.

2006689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 2006689 is about 1416.5765069349. The cubic root of 2006689 is about 126.1324088885.

It can be divided in two parts, 200 and 6689, that added together give a square (6889 = 83²).

The spelling of 2006689 in words is "two million, six thousand, six hundred eighty-nine".