12557642 has 4 divisors (see below), whose sum is σ = 18836466. Its totient is φ = 6278820.

The previous prime is 12557641. The next prime is 12557647. The reversal of 12557642 is 24675521.

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

It can be written as a sum of positive squares in only one way, i.e., 11978521 + 579121 = 3461^2 + 761^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12557599 and 12557608.

It is not an unprimeable number, because it can be changed into a prime (12557641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3139409 + ... + 3139412.

Almost surely, 2^12557642 is an apocalyptic number.

12557642 is a deficient number, since it is larger than the sum of its proper divisors (6278824).

12557642 is an equidigital number, since it uses as much as digits as its factorization.

12557642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6278823.

The product of its digits is 16800, while the sum is 32.

The square root of 12557642 is about 3543.6763396225. The cubic root of 12557642 is about 232.4356286896.

The spelling of 12557642 in words is "twelve million, five hundred fifty-seven thousand, six hundred forty-two".