12557947 has 4 divisors (see below), whose sum is σ = 12568536. Its totient is φ = 12547360.

The previous prime is 12557933. The next prime is 12557953. The reversal of 12557947 is 74975521.

12557947 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 74975521 = 2699 ⋅27779.

It is a cyclic number.

It is not a de Polignac number, because 12557947 - 2⁷ = 12557819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12557647) 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, 3253 + ... + 5974.

It is an arithmetic number, because the mean of its divisors is an integer number (3142134).

Almost surely, 2^12557947 is an apocalyptic number.

12557947 is a deficient number, since it is larger than the sum of its proper divisors (10589).

12557947 is an equidigital number, since it uses as much as digits as its factorization.

12557947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10588.

The product of its digits is 88200, while the sum is 40.

The square root of 12557947 is about 3543.7193737654. The cubic root of 12557947 is about 232.4375104732.

The spelling of 12557947 in words is "twelve million, five hundred fifty-seven thousand, nine hundred forty-seven".