2117805 has 16 divisors (see below), whose sum is σ = 3447360. Its totient is φ = 1109888.

The previous prime is 2117777. The next prime is 2117813. The reversal of 2117805 is 5087112.

It is a cyclic number.

It is not a de Polignac number, because 2117805 - 2⁷ = 2117677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (215460).

2^2117805 is an apocalyptic number.

It is an amenable number.

2117805 is a deficient number, since it is larger than the sum of its proper divisors (1329555).

2117805 is a wasteful number, since it uses less digits than its factorization.

2117805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 2117805 is about 1455.2680165523. The cubic root of 2117805 is about 128.4188145099.

The spelling of 2117805 in words is "two million, one hundred seventeen thousand, eight hundred five".