2117739 has 12 divisors (see below), whose sum is σ = 3058296. Its totient is φ = 1302912.

The previous prime is 2117729. The next prime is 2117743. The reversal of 2117739 is 9377112.

It is not a de Polignac number, because 2117739 - 2⁴ = 2117723 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2117719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1582 + ... + 2595.

It is an arithmetic number, because the mean of its divisors is an integer number (254858).

2^2117739 is an apocalyptic number.

2117739 is a deficient number, since it is larger than the sum of its proper divisors (940557).

2117739 is a wasteful number, since it uses less digits than its factorization.

2117739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4206 (or 4193 counting only the distinct ones).

The product of its digits is 2646, while the sum is 30.

The square root of 2117739 is about 1455.2453401403. The cubic root of 2117739 is about 128.4174804667.

The spelling of 2117739 in words is "two million, one hundred seventeen thousand, seven hundred thirty-nine".