1278713 has 2 divisors, whose sum is σ = 1278714. Its totient is φ = 1278712.

The previous prime is 1278709. The next prime is 1278721. The reversal of 1278713 is 3178721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659344 + 619369 = 812^2 + 787^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278713 - 2² = 1278709 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1278733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639356 + 639357.

It is an arithmetic number, because the mean of its divisors is an integer number (639357).

2^1278713 is an apocalyptic number.

It is an amenable number.

1278713 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278713 is an equidigital number, since it uses as much as digits as its factorization.

1278713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 29.

The square root of 1278713 is about 1130.8019278371. The cubic root of 1278713 is about 108.5403022994.

It can be divided in two parts, 1278 and 713, that added together give a palindrome (1991).

The spelling of 1278713 in words is "one million, two hundred seventy-eight thousand, seven hundred thirteen".