1284821 has 4 divisors (see below), whose sum is σ = 1297644. Its totient is φ = 1272000.

The previous prime is 1284793. The next prime is 1284823.

1284821 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1188100 + 96721 = 1090^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1284821 - 2¹⁰ = 1283797 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 6260 + ... + 6461.

It is an arithmetic number, because the mean of its divisors is an integer number (324411).

2^1284821 is an apocalyptic number.

It is an amenable number.

1284821 is a deficient number, since it is larger than the sum of its proper divisors (12823).

1284821 is a wasteful number, since it uses less digits than its factorization.

1284821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12822.

The product of its digits is 1024, while the sum is 26.

The square root of 1284821 is about 1133.4994486104. The cubic root of 1284821 is about 108.7128485419.

The spelling of 1284821 in words is "one million, two hundred eighty-four thousand, eight hundred twenty-one".