2106005 has 18 divisors (see below), whose sum is σ = 2825718. Its totient is φ = 1505680.

The previous prime is 2105993. The next prime is 2106019. The reversal of 2106005 is 5006012.

It can be written as a sum of positive squares in only one way, i.e., 1684804 + 421201 = 1298^2 + 649^2 .

It is not a de Polignac number, because 2106005 - 2¹² = 2101909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 35666 + ... + 35724.

2^2106005 is an apocalyptic number.

It is an amenable number.

2106005 is a deficient number, since it is larger than the sum of its proper divisors (719713).

2106005 is an equidigital number, since it uses as much as digits as its factorization.

2106005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 2106005 is about 1451.2081173974. The cubic root of 2106005 is about 128.1798618910.

The spelling of 2106005 in words is "two million, one hundred six thousand, five".