1287822 has 16 divisors (see below), whose sum is σ = 2645712. Its totient is φ = 417600.

The previous prime is 1287821. The next prime is 1287829. The reversal of 1287822 is 2287821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a 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 in 7 ways as a sum of consecutive naturals, for example, 2679 + ... + 3122.

It is an arithmetic number, because the mean of its divisors is an integer number (165357).

2^1287822 is an apocalyptic number.

1287822 is an abundant number, since it is smaller than the sum of its proper divisors (1357890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1287822 is a wasteful number, since it uses less digits than its factorization.

1287822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5843.

The product of its digits is 3584, while the sum is 30.

The square root of 1287822 is about 1134.8224530736. The cubic root of 1287822 is about 108.7974241569.

Subtracting 1287822 from its reverse (2287821), we obtain a palindrome (999999).

The spelling of 1287822 in words is "one million, two hundred eighty-seven thousand, eight hundred twenty-two".