1320783 has 4 divisors (see below), whose sum is σ = 1761048. Its totient is φ = 880520.

The previous prime is 1320773. The next prime is 1320791. The reversal of 1320783 is 3870231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3870231 = 3 ⋅1290077.

It is a cyclic number.

It is not a de Polignac number, because 1320783 - 2⁵ = 1320751 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220128 + ... + 220133.

It is an arithmetic number, because the mean of its divisors is an integer number (440262).

2^1320783 is an apocalyptic number.

1320783 is a deficient number, since it is larger than the sum of its proper divisors (440265).

1320783 is an equidigital number, since it uses as much as digits as its factorization.

1320783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440264.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 1320783 is about 1149.2532358014. The cubic root of 1320783 is about 109.7178166782.

The spelling of 1320783 in words is "one million, three hundred twenty thousand, seven hundred eighty-three".