1287841 has 2 divisors, whose sum is σ = 1287842. Its totient is φ = 1287840.

The previous prime is 1287829. The next prime is 1287857. The reversal of 1287841 is 1487821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1210000 + 77841 = 1100^2 + 279^2 .

It is an emirp because it is prime and its reverse (1487821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287841 - 2⁹ = 1287329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1287821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643920 + 643921.

It is an arithmetic number, because the mean of its divisors is an integer number (643921).

2^1287841 is an apocalyptic number.

It is an amenable number.

1287841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287841 is an equidigital number, since it uses as much as digits as its factorization.

1287841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3584, while the sum is 31.

The square root of 1287841 is about 1134.8308243963. The cubic root of 1287841 is about 108.7979592052.

The spelling of 1287841 in words is "one million, two hundred eighty-seven thousand, eight hundred forty-one".