1278659 has 2 divisors, whose sum is σ = 1278660. Its totient is φ = 1278658.

The previous prime is 1278637. The next prime is 1278671. The reversal of 1278659 is 9568721.

It is a strong prime.

It is an emirp because it is prime and its reverse (9568721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1278659 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1278619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639329 + 639330.

It is an arithmetic number, because the mean of its divisors is an integer number (639330).

2^1278659 is an apocalyptic number.

1278659 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278659 is an equidigital number, since it uses as much as digits as its factorization.

1278659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 1278659 is about 1130.7780507244. The cubic root of 1278659 is about 108.5387743937.

The spelling of 1278659 in words is "one million, two hundred seventy-eight thousand, six hundred fifty-nine".