1266779 has 2 divisors, whose sum is σ = 1266780. Its totient is φ = 1266778.

The previous prime is 1266767. The next prime is 1266781. The reversal of 1266779 is 9776621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1266779 - 2⁴ = 1266763 is a prime.

Together with 1266781, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1266719) 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, 633389 + 633390.

It is an arithmetic number, because the mean of its divisors is an integer number (633390).

2^1266779 is an apocalyptic number.

1266779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266779 is an equidigital number, since it uses as much as digits as its factorization.

1266779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 1266779 is about 1125.5127720288. The cubic root of 1266779 is about 108.2015839539.

The spelling of 1266779 in words is "one million, two hundred sixty-six thousand, seven hundred seventy-nine".