2117605 has 16 divisors (see below), whose sum is σ = 3075840. Its totient is φ = 1366272.

The previous prime is 2117597. The next prime is 2117611. The reversal of 2117605 is 5067112.

2117605 = T₁₂₆ + T₁₂₇ + ... + T₂₄₄.

2117605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2117605 - 2³ = 2117597 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1185 + ... + 2374.

It is an arithmetic number, because the mean of its divisors is an integer number (192240).

2^2117605 is an apocalyptic number.

It is an amenable number.

2117605 is a deficient number, since it is larger than the sum of its proper divisors (958235).

2117605 is a wasteful number, since it uses less digits than its factorization.

2117605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 2117605 is about 1455.1992990653. The cubic root of 2117605 is about 128.4147718696.

The spelling of 2117605 in words is "two million, one hundred seventeen thousand, six hundred five".