12439717 has 4 divisors (see below), whose sum is σ = 12451660. Its totient is φ = 12427776.

The previous prime is 12439673. The next prime is 12439723. The reversal of 12439717 is 71793421.

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 7834401 + 4605316 = 2799^2 + 2146^2 .

It is a cyclic number.

It is not a de Polignac number, because 12439717 - 2¹⁵ = 12406949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12439727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4242 + ... + 6547.

It is an arithmetic number, because the mean of its divisors is an integer number (3112915).

Almost surely, 2^12439717 is an apocalyptic number.

It is an amenable number.

12439717 is a deficient number, since it is larger than the sum of its proper divisors (11943).

12439717 is a wasteful number, since it uses less digits than its factorization.

12439717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11942.

The product of its digits is 10584, while the sum is 34.

The square root of 12439717 is about 3526.9982988371. The cubic root of 12439717 is about 231.7057617946.

The spelling of 12439717 in words is "twelve million, four hundred thirty-nine thousand, seven hundred seventeen".