1320309983 has 4 divisors (see below), whose sum is σ = 1321070088. Its totient is φ = 1319549880.

The previous prime is 1320309979. The next prime is 1320310007. The reversal of 1320309983 is 3899030231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3899030231 = 173 ⋅22537747.

It is a cyclic number.

It is not a de Polignac number, because 1320309983 - 2² = 1320309979 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 (1320309953) 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, 377441 + ... + 380922.

It is an arithmetic number, because the mean of its divisors is an integer number (330267522).

Almost surely, 2^1320309983 is an apocalyptic number.

1320309983 is a deficient number, since it is larger than the sum of its proper divisors (760105).

1320309983 is an equidigital number, since it uses as much as digits as its factorization.

1320309983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760104.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 1320309983 is about 36336.0699993822. The cubic root of 1320309983 is about 1097.0471722905.

The spelling of 1320309983 in words is "one billion, three hundred twenty million, three hundred nine thousand, nine hundred eighty-three".