2117709 has 12 divisors (see below), whose sum is σ = 3337152. Its totient is φ = 1283400.

The previous prime is 2117701. The next prime is 2117711. The reversal of 2117709 is 9077112.

It is not a de Polignac number, because 2117709 - 2³ = 2117701 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117701) 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 11 ways as a sum of consecutive naturals, for example, 10597 + ... + 10794.

It is an arithmetic number, because the mean of its divisors is an integer number (278096).

2^2117709 is an apocalyptic number.

It is an amenable number.

2117709 is a deficient number, since it is larger than the sum of its proper divisors (1219443).

2117709 is a wasteful number, since it uses less digits than its factorization.

2117709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21408 (or 21405 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 2117709 is about 1455.2350325635. The cubic root of 2117709 is about 128.4168740743.

It can be divided in two parts, 2 and 117709, that added together give a palindrome (117711).

The spelling of 2117709 in words is "two million, one hundred seventeen thousand, seven hundred nine".