12715657 has 4 divisors (see below), whose sum is σ = 12735556. Its totient is φ = 12695760.

The previous prime is 12715649. The next prime is 12715667. The reversal of 12715657 is 75651721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75651721 = 293 ⋅258197.

It can be written as a sum of positive squares in 2 ways, for example, as 5645376 + 7070281 = 2376^2 + 2659^2 .

It is a cyclic number.

It is not a de Polignac number, because 12715657 - 2³ = 12715649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12715607) 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, 8958 + ... + 10279.

It is an arithmetic number, because the mean of its divisors is an integer number (3183889).

Almost surely, 2^12715657 is an apocalyptic number.

It is an amenable number.

12715657 is a deficient number, since it is larger than the sum of its proper divisors (19899).

12715657 is an equidigital number, since it uses as much as digits as its factorization.

12715657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19898.

The product of its digits is 14700, while the sum is 34.

The square root of 12715657 is about 3565.9019896795. The cubic root of 12715657 is about 233.4064938385.

The spelling of 12715657 in words is "twelve million, seven hundred fifteen thousand, six hundred fifty-seven".