320540743 has 4 divisors (see below), whose sum is σ = 321378048. Its totient is φ = 319703440.

The previous prime is 320540699. The next prime is 320540749. The reversal of 320540743 is 347045023.

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 320540743 - 2¹³ = 320532551 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 (320540749) 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, 418078 + ... + 418843.

It is an arithmetic number, because the mean of its divisors is an integer number (80344512).

Almost surely, 2^320540743 is an apocalyptic number.

320540743 is a deficient number, since it is larger than the sum of its proper divisors (837305).

320540743 is an equidigital number, since it uses as much as digits as its factorization.

320540743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837304.

The product of its (nonzero) digits is 10080, while the sum is 28.

The square root of 320540743 is about 17903.6516666294. The cubic root of 320540743 is about 684.3754358274.

Adding to 320540743 its reverse (347045023), we get a palindrome (667585766).

The spelling of 320540743 in words is "three hundred twenty million, five hundred forty thousand, seven hundred forty-three".