1000663 has 4 divisors (see below), whose sum is σ = 1003408. Its totient is φ = 997920.

The previous prime is 1000651. The next prime is 1000667. The reversal of 1000663 is 3660001.

It is a happy number.

1000663 is nontrivially palindromic in base 3.

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 1000663 - 2⁹ = 1000151 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 (1000667) 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, 723 + ... + 1588.

It is an arithmetic number, because the mean of its divisors is an integer number (250852).

2^1000663 is an apocalyptic number.

1000663 is a deficient number, since it is larger than the sum of its proper divisors (2745).

1000663 is an equidigital number, since it uses as much as digits as its factorization.

1000663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1000663 is about 1000.3314450721. The cubic root of 1000663 is about 100.0220951177.

Adding to 1000663 its reverse (3660001), we get a palindrome (4660664).

The spelling of 1000663 in words is "one million, six hundred sixty-three", and thus it is an aban number.