12757442 has 4 divisors (see below), whose sum is σ = 19136166. Its totient is φ = 6378720.

The previous prime is 12757441. The next prime is 12757453. The reversal of 12757442 is 24475721.

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., 12453841 + 303601 = 3529^2 + 551^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12757399 and 12757408.

It is not an unprimeable number, because it can be changed into a prime (12757441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3189359 + ... + 3189362.

Almost surely, 2^12757442 is an apocalyptic number.

12757442 is a deficient number, since it is larger than the sum of its proper divisors (6378724).

12757442 is an equidigital number, since it uses as much as digits as its factorization.

12757442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6378723.

The product of its digits is 15680, while the sum is 32.

The square root of 12757442 is about 3571.7561506911. The cubic root of 12757442 is about 233.6618804797.

The spelling of 12757442 in words is "twelve million, seven hundred fifty-seven thousand, four hundred forty-two".