1284321 has 8 divisors (see below), whose sum is σ = 1728864. Its totient is φ = 848000.

The previous prime is 1284317. The next prime is 1284329. The reversal of 1284321 is 1234821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1284321 - 2² = 1284317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1284329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1680 + ... + 2321.

It is an arithmetic number, because the mean of its divisors is an integer number (216108).

2^1284321 is an apocalyptic number.

It is an amenable number.

1284321 is a deficient number, since it is larger than the sum of its proper divisors (444543).

1284321 is a wasteful number, since it uses less digits than its factorization.

1284321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111.

The product of its digits is 384, while the sum is 21.

The square root of 1284321 is about 1133.2788712404. The cubic root of 1284321 is about 108.6987445080.

It can be divided in two parts, 1284 and 321, that multiplied together give a square (412164 = 642²).

The spelling of 1284321 in words is "one million, two hundred eighty-four thousand, three hundred twenty-one".