1284889 has 2 divisors, whose sum is σ = 1284890. Its totient is φ = 1284888.

The previous prime is 1284863. The next prime is 1284901. The reversal of 1284889 is 9884821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 652864 + 632025 = 808^2 + 795^2 .

It is an emirp because it is prime and its reverse (9884821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1284889 is a prime.

It is a Chen prime.

1284889 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1224889) 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, 642444 + 642445.

It is an arithmetic number, because the mean of its divisors is an integer number (642445).

2^1284889 is an apocalyptic number.

It is an amenable number.

1284889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1284889 is an equidigital number, since it uses as much as digits as its factorization.

1284889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 40.

The square root of 1284889 is about 1133.5294438170. The cubic root of 1284889 is about 108.7147664078.

The spelling of 1284889 in words is "one million, two hundred eighty-four thousand, eight hundred eighty-nine".