1284663 has 4 divisors (see below), whose sum is σ = 1712888. Its totient is φ = 856440.

The previous prime is 1284659. The next prime is 1284691. The reversal of 1284663 is 3664821.

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

It is not a de Polignac number, because 1284663 - 2² = 1284659 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1284663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284623) 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, 214108 + ... + 214113.

It is an arithmetic number, because the mean of its divisors is an integer number (428222).

2^1284663 is an apocalyptic number.

1284663 is a deficient number, since it is larger than the sum of its proper divisors (428225).

1284663 is an equidigital number, since it uses as much as digits as its factorization.

1284663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428224.

The product of its digits is 6912, while the sum is 30.

The square root of 1284663 is about 1133.4297508006. The cubic root of 1284663 is about 108.7083920627.

The spelling of 1284663 in words is "one million, two hundred eighty-four thousand, six hundred sixty-three".