1320745747 has 4 divisors (see below), whose sum is σ = 1356441616. Its totient is φ = 1285049880.

The previous prime is 1320745733. The next prime is 1320745757. The reversal of 1320745747 is 7475470231.

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 1320745747 - 2²³ = 1312357139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320745757) 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, 17847879 + ... + 17847952.

It is an arithmetic number, because the mean of its divisors is an integer number (339110404).

Almost surely, 2^1320745747 is an apocalyptic number.

1320745747 is a deficient number, since it is larger than the sum of its proper divisors (35695869).

1320745747 is an equidigital number, since it uses as much as digits as its factorization.

1320745747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35695868.

The product of its (nonzero) digits is 164640, while the sum is 40.

The square root of 1320745747 is about 36342.0658053446. The cubic root of 1320745747 is about 1097.1678512942.

The spelling of 1320745747 in words is "one billion, three hundred twenty million, seven hundred forty-five thousand, seven hundred forty-seven".