1289747 has 2 divisors, whose sum is σ = 1289748. Its totient is φ = 1289746.

The previous prime is 1289731. The next prime is 1289749. The reversal of 1289747 is 7479821.

It is a strong prime.

It is an emirp because it is prime and its reverse (7479821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1289747 - 2⁴ = 1289731 is a prime.

Together with 1289749, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1289747.

It is not a weakly prime, because it can be changed into another prime (1289749) 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, 644873 + 644874.

It is an arithmetic number, because the mean of its divisors is an integer number (644874).

2^1289747 is an apocalyptic number.

1289747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289747 is an equidigital number, since it uses as much as digits as its factorization.

1289747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 38.

The square root of 1289747 is about 1135.6702866589. The cubic root of 1289747 is about 108.8516062761.

The spelling of 1289747 in words is "one million, two hundred eighty-nine thousand, seven hundred forty-seven".