1287829 has 2 divisors, whose sum is σ = 1287830. Its totient is φ = 1287828.

The previous prime is 1287821. The next prime is 1287841. The reversal of 1287829 is 9287821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1199025 + 88804 = 1095^2 + 298^2 .

It is an emirp because it is prime and its reverse (9287821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287829 - 2³ = 1287821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287821) 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, 643914 + 643915.

It is an arithmetic number, because the mean of its divisors is an integer number (643915).

2^1287829 is an apocalyptic number.

It is an amenable number.

1287829 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287829 is an equidigital number, since it uses as much as digits as its factorization.

1287829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 1287829 is about 1134.8255372523. The cubic root of 1287829 is about 108.7976212805.

It can be divided in two parts, 1287 and 829, that added together give a square (2116 = 46²).

The spelling of 1287829 in words is "one million, two hundred eighty-seven thousand, eight hundred twenty-nine".