12778427 has 2 divisors, whose sum is σ = 12778428. Its totient is φ = 12778426.

The previous prime is 12778421. The next prime is 12778433. The reversal of 12778427 is 72487721.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (12778421) and next prime (12778433).

It is an emirp because it is prime and its reverse (72487721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12778427 - 2¹⁶ = 12712891 is a prime.

It is not a weakly prime, because it can be changed into another prime (12778421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6389213 + 6389214.

It is an arithmetic number, because the mean of its divisors is an integer number (6389214).

Almost surely, 2^12778427 is an apocalyptic number.

12778427 is a deficient number, since it is larger than the sum of its proper divisors (1).

12778427 is an equidigital number, since it uses as much as digits as its factorization.

12778427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43904, while the sum is 38.

The square root of 12778427 is about 3574.6925741943. The cubic root of 12778427 is about 233.7899288363.

The spelling of 12778427 in words is "twelve million, seven hundred seventy-eight thousand, four hundred twenty-seven".