2109605 has 8 divisors (see below), whose sum is σ = 2619000. Its totient is φ = 1629376.

The previous prime is 2109593. The next prime is 2109607. The reversal of 2109605 is 5069012.

It can be written as a sum of positive squares in 4 ways, for example, as 516961 + 1592644 = 719^2 + 1262^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2109605 - 2¹⁶ = 2044069 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109607) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7130 + ... + 7419.

It is an arithmetic number, because the mean of its divisors is an integer number (327375).

2^2109605 is an apocalyptic number.

It is an amenable number.

2109605 is a deficient number, since it is larger than the sum of its proper divisors (509395).

2109605 is a wasteful number, since it uses less digits than its factorization.

2109605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14583.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 2109605 is about 1452.4479336623. The cubic root of 2109605 is about 128.2528570991.

The spelling of 2109605 in words is "two million, one hundred nine thousand, six hundred five".