1320003 has 8 divisors (see below), whose sum is σ = 1955600. Its totient is φ = 879984.

The previous prime is 1319963. The next prime is 1320019. The reversal of 1320003 is 3000231.

It is a happy number.

It is not a de Polignac number, because 1320003 - 2¹² = 1315907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24418 + ... + 24471.

It is an arithmetic number, because the mean of its divisors is an integer number (244450).

2^1320003 is an apocalyptic number.

1320003 is a deficient number, since it is larger than the sum of its proper divisors (635597).

1320003 is an equidigital number, since it uses as much as digits as its factorization.

1320003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48898 (or 48892 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

The square root of 1320003 is about 1148.9138348893. The cubic root of 1320003 is about 109.6962141517.

Adding to 1320003 its reverse (3000231), we get a palindrome (4320234).

The spelling of 1320003 in words is "one million, three hundred twenty thousand, three".