1298789 has 2 divisors, whose sum is σ = 1298790. Its totient is φ = 1298788.

The previous prime is 1298779. The next prime is 1298797. The reversal of 1298789 is 9878921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 748225 + 550564 = 865^2 + 742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1298789 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1298719) 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, 649394 + 649395.

It is an arithmetic number, because the mean of its divisors is an integer number (649395).

2^1298789 is an apocalyptic number.

It is an amenable number.

1298789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1298789 is an equidigital number, since it uses as much as digits as its factorization.

1298789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 1298789 is about 1139.6442427354. The cubic root of 1298789 is about 109.1053886294.

The spelling of 1298789 in words is "one million, two hundred ninety-eight thousand, seven hundred eighty-nine".