12745557 has 24 divisors (see below), whose sum is σ = 20736768. Its totient is φ = 7473600.

The previous prime is 12745549. The next prime is 12745567. The reversal of 12745557 is 75554721.

It is not a de Polignac number, because 12745557 - 2³ = 12745549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12745567) 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 23 ways as a sum of consecutive naturals, for example, 993 + ... + 5145.

It is an arithmetic number, because the mean of its divisors is an integer number (864032).

Almost surely, 2^12745557 is an apocalyptic number.

It is an amenable number.

12745557 is a deficient number, since it is larger than the sum of its proper divisors (7991211).

12745557 is a wasteful number, since it uses less digits than its factorization.

12745557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4201 (or 4198 counting only the distinct ones).

The product of its digits is 49000, while the sum is 36.

The square root of 12745557 is about 3570.0920156209. The cubic root of 12745557 is about 233.5892971128.

The spelling of 12745557 in words is "twelve million, seven hundred forty-five thousand, five hundred fifty-seven".