1275979 has 2 divisors, whose sum is σ = 1275980. Its totient is φ = 1275978.

The previous prime is 1275977. The next prime is 1276001. The reversal of 1275979 is 9795721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1275979 - 2¹ = 1275977 is a prime.

Together with 1275977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1275973) 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, 637989 + 637990.

It is an arithmetic number, because the mean of its divisors is an integer number (637990).

2^1275979 is an apocalyptic number.

1275979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275979 is an equidigital number, since it uses as much as digits as its factorization.

1275979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 40.

The square root of 1275979 is about 1129.5924043654. The cubic root of 1275979 is about 108.4628908892.

The spelling of 1275979 in words is "one million, two hundred seventy-five thousand, nine hundred seventy-nine".