2117705 has 4 divisors (see below), whose sum is σ = 2541252. Its totient is φ = 1694160.

The previous prime is 2117701. The next prime is 2117711. The reversal of 2117705 is 5077112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 425104 + 1692601 = 652^2 + 1301^2 .

It is not a de Polignac number, because 2117705 - 2² = 2117701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2117701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211766 + ... + 211775.

It is an arithmetic number, because the mean of its divisors is an integer number (635313).

2^2117705 is an apocalyptic number.

It is an amenable number.

2117705 is a deficient number, since it is larger than the sum of its proper divisors (423547).

2117705 is an equidigital number, since it uses as much as digits as its factorization.

2117705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423546.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 2117705 is about 1455.2336582144. The cubic root of 2117705 is about 128.4167932216.

The spelling of 2117705 in words is "two million, one hundred seventeen thousand, seven hundred five".