1279787 has 2 divisors, whose sum is σ = 1279788. Its totient is φ = 1279786.

The previous prime is 1279757. The next prime is 1279801. The reversal of 1279787 is 7879721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1279787 - 2¹² = 1275691 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279727) 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, 639893 + 639894.

It is an arithmetic number, because the mean of its divisors is an integer number (639894).

2^1279787 is an apocalyptic number.

1279787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279787 is an equidigital number, since it uses as much as digits as its factorization.

1279787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 41.

The square root of 1279787 is about 1131.2767123918. The cubic root of 1279787 is about 108.5706817156.

The spelling of 1279787 in words is "one million, two hundred seventy-nine thousand, seven hundred eighty-seven".