1284822 has 80 divisors (see below), whose sum is σ = 3624192. Its totient is φ = 330480.

The previous prime is 1284793. The next prime is 1284823. The reversal of 1284822 is 2284821.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284823) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 12423 + ... + 12525.

2^1284822 is an apocalyptic number.

It is a pronic number, being equal to 1133×1134.

It is a practical number, because each smaller number is the sum of distinct divisors of 1284822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1812096).

1284822 is an abundant number, since it is smaller than the sum of its proper divisors (2339370).

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

1284822 is a wasteful number, since it uses less digits than its factorization.

1284822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 126 counting only the distinct ones).

The product of its digits is 2048, while the sum is 27.

The square root of 1284822 is about 1133.4998897221. The cubic root of 1284822 is about 108.7128767463.

1284822 divided by its sum of digits (27) gives a triangular number (47586 = T₃₀₈).

Subtracting 1284822 from its reverse (2284821), we obtain a palindrome (999999).

It can be divided in two parts, 128 and 4822, that added together give a triangular number (4950 = T₉₉).

The spelling of 1284822 in words is "one million, two hundred eighty-four thousand, eight hundred twenty-two".