12781427 has 8 divisors (see below), whose sum is σ = 13078800. Its totient is φ = 12486240.

The previous prime is 12781423. The next prime is 12781429. The reversal of 12781427 is 72418721.

It is a happy number.

12781427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12781427 - 2² = 12781423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12781393 and 12781402.

It is not an unprimeable number, because it can be changed into a prime (12781421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18152 + ... + 18842.

It is an arithmetic number, because the mean of its divisors is an integer number (1634850).

Almost surely, 2^12781427 is an apocalyptic number.

12781427 is a deficient number, since it is larger than the sum of its proper divisors (297373).

12781427 is an equidigital number, since it uses as much as digits as its factorization.

12781427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093.

The product of its digits is 6272, while the sum is 32.

The square root of 12781427 is about 3575.1121660726. The cubic root of 12781427 is about 233.8082230783.

The spelling of 12781427 in words is "twelve million, seven hundred eighty-one thousand, four hundred twenty-seven".