2090689 has 2 divisors, whose sum is σ = 2090690. Its totient is φ = 2090688.

The previous prime is 2090681. The next prime is 2090717. The reversal of 2090689 is 9860902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1690000 + 400689 = 1300^2 + 633^2 .

It is a cyclic number.

It is not a de Polignac number, because 2090689 - 2³ = 2090681 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2090681) by changing a digit.

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 as a sum of consecutive naturals, namely, 1045344 + 1045345.

It is an arithmetic number, because the mean of its divisors is an integer number (1045345).

2^2090689 is an apocalyptic number.

It is an amenable number.

2090689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2090689 is an equidigital number, since it uses as much as digits as its factorization.

2090689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 2090689 is about 1445.9215054767. The cubic root of 2090689 is about 127.8683746213.

It can be divided in two parts, 20 and 90689, that added together give a palindrome (90709).

The spelling of 2090689 in words is "two million, ninety thousand, six hundred eighty-nine".