2129717 has 4 divisors (see below), whose sum is σ = 2138796. Its totient is φ = 2120640.

The previous prime is 2129713. The next prime is 2129719. The reversal of 2129717 is 7179212.

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 1976836 + 152881 = 1406^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129717 - 2² = 2129713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2129717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129713) 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, 4178 + ... + 4659.

It is an arithmetic number, because the mean of its divisors is an integer number (534699).

2^2129717 is an apocalyptic number.

It is an amenable number.

2129717 is a deficient number, since it is larger than the sum of its proper divisors (9079).

2129717 is an equidigital number, since it uses as much as digits as its factorization.

2129717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9078.

The product of its digits is 1764, while the sum is 29.

The square root of 2129717 is about 1459.3549945096. The cubic root of 2129717 is about 128.6591365682.

The spelling of 2129717 in words is "two million, one hundred twenty-nine thousand, seven hundred seventeen".