1284021 has 12 divisors (see below), whose sum is σ = 1935648. Its totient is φ = 818664.

The previous prime is 1284007. The next prime is 1284037. The reversal of 1284021 is 1204821.

It is not a de Polignac number, because 1284021 - 2⁶ = 1283957 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1283985 and 1284003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2895 + ... + 3308.

It is an arithmetic number, because the mean of its divisors is an integer number (161304).

2^1284021 is an apocalyptic number.

It is an amenable number.

1284021 is a deficient number, since it is larger than the sum of its proper divisors (651627).

1284021 is a wasteful number, since it uses less digits than its factorization.

1284021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6232 (or 6229 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1284021 is about 1133.1465042085. The cubic root of 1284021 is about 108.6902803305.

Subtracting from 1284021 its sum of digits (18), we obtain a triangular number (1284003 = T₁₆₀₂).

Adding to 1284021 its reverse (1204821), we get a palindrome (2488842).

The spelling of 1284021 in words is "one million, two hundred eighty-four thousand, twenty-one".