1281827 has 2 divisors, whose sum is σ = 1281828. Its totient is φ = 1281826.

The previous prime is 1281823. The next prime is 1281853. The reversal of 1281827 is 7281821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1281827 - 2² = 1281823 is a prime.

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 1281827.

It is not a weakly prime, because it can be changed into another prime (1281821) 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, 640913 + 640914.

It is an arithmetic number, because the mean of its divisors is an integer number (640914).

2^1281827 is an apocalyptic number.

1281827 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281827 is an equidigital number, since it uses as much as digits as its factorization.

1281827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 29.

The square root of 1281827 is about 1132.1779895405. The cubic root of 1281827 is about 108.6283388653.

The spelling of 1281827 in words is "one million, two hundred eighty-one thousand, eight hundred twenty-seven".