12439657 has 4 divisors (see below), whose sum is σ = 12468820. Its totient is φ = 12410496.

The previous prime is 12439643. The next prime is 12439667. The reversal of 12439657 is 75693421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75693421 = 41 ⋅1846181.

It can be written as a sum of positive squares in 2 ways, for example, as 2835856 + 9603801 = 1684^2 + 3099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12439657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12439607) 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, 13932 + ... + 14797.

It is an arithmetic number, because the mean of its divisors is an integer number (3117205).

Almost surely, 2^12439657 is an apocalyptic number.

It is an amenable number.

12439657 is a deficient number, since it is larger than the sum of its proper divisors (29163).

12439657 is an equidigital number, since it uses as much as digits as its factorization.

12439657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29162.

The product of its digits is 45360, while the sum is 37.

The square root of 12439657 is about 3526.9897930105. The cubic root of 12439657 is about 231.7053892682.

The spelling of 12439657 in words is "twelve million, four hundred thirty-nine thousand, six hundred fifty-seven".