12557477 has 4 divisors (see below), whose sum is σ = 12570060. Its totient is φ = 12544896.

The previous prime is 12557473. The next prime is 12557483. The reversal of 12557477 is 77475521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8561476 + 3996001 = 2926^2 + 1999^2 .

It is a cyclic number.

It is not a de Polignac number, because 12557477 - 2² = 12557473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12557477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12557473) 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, 4652 + ... + 6837.

It is an arithmetic number, because the mean of its divisors is an integer number (3142515).

Almost surely, 2^12557477 is an apocalyptic number.

It is an amenable number.

12557477 is a deficient number, since it is larger than the sum of its proper divisors (12583).

12557477 is a wasteful number, since it uses less digits than its factorization.

12557477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12582.

The product of its digits is 68600, while the sum is 38.

The square root of 12557477 is about 3543.6530586388. The cubic root of 12557477 is about 232.4346106629.

The spelling of 12557477 in words is "twelve million, five hundred fifty-seven thousand, four hundred seventy-seven".