12457517 has 4 divisors (see below), whose sum is σ = 12466236. Its totient is φ = 12448800.

The previous prime is 12457499. The next prime is 12457519. The reversal of 12457517 is 71575421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4583881 + 7873636 = 2141^2 + 2806^2 .

It is a cyclic number.

It is not a de Polignac number, because 12457517 - 2⁶ = 12457453 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 (12457519) 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, 1658 + ... + 5259.

It is an arithmetic number, because the mean of its divisors is an integer number (3116559).

Almost surely, 2^12457517 is an apocalyptic number.

It is an amenable number.

12457517 is a deficient number, since it is larger than the sum of its proper divisors (8719).

12457517 is an equidigital number, since it uses as much as digits as its factorization.

12457517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8718.

The product of its digits is 9800, while the sum is 32.

The square root of 12457517 is about 3529.5207890024. The cubic root of 12457517 is about 231.8162251044.

The spelling of 12457517 in words is "twelve million, four hundred fifty-seven thousand, five hundred seventeen".