1303663 has 4 divisors (see below), whose sum is σ = 1360368. Its totient is φ = 1246960.

The previous prime is 1303633. The next prime is 1303667. The reversal of 1303663 is 3663031.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1303663 - 2⁹ = 1303151 is a prime.

It is a Duffinian number.

1303663 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1303667) 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 3 ways as a sum of consecutive naturals, for example, 28318 + ... + 28363.

It is an arithmetic number, because the mean of its divisors is an integer number (340092).

2^1303663 is an apocalyptic number.

1303663 is a deficient number, since it is larger than the sum of its proper divisors (56705).

1303663 is an equidigital number, since it uses as much as digits as its factorization.

1303663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56704.

The product of its (nonzero) digits is 972, while the sum is 22.

The square root of 1303663 is about 1141.7806269157. The cubic root of 1303663 is about 109.2416991565.

Adding to 1303663 its reverse (3663031), we get a palindrome (4966694).

The spelling of 1303663 in words is "one million, three hundred three thousand, six hundred sixty-three".