1279643 has 2 divisors, whose sum is σ = 1279644. Its totient is φ = 1279642.

The previous prime is 1279627. The next prime is 1279657. The reversal of 1279643 is 3469721.

It is a strong prime.

It is an emirp because it is prime and its reverse (3469721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1279643 - 2⁴ = 1279627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1279673) 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, 639821 + 639822.

It is an arithmetic number, because the mean of its divisors is an integer number (639822).

2^1279643 is an apocalyptic number.

1279643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279643 is an equidigital number, since it uses as much as digits as its factorization.

1279643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 1279643 is about 1131.2130656954. The cubic root of 1279643 is about 108.5666094847.

The spelling of 1279643 in words is "one million, two hundred seventy-nine thousand, six hundred forty-three".