320390743 has 4 divisors (see below), whose sum is σ = 322512688. Its totient is φ = 318268800.

The previous prime is 320390737. The next prime is 320390747. The reversal of 320390743 is 347093023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 347093023 = 23 ⋅15091001.

It is a cyclic number.

It is not a de Polignac number, because 320390743 - 2¹⁷ = 320259671 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 (320390747) 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, 1060746 + ... + 1061047.

It is an arithmetic number, because the mean of its divisors is an integer number (80628172).

Almost surely, 2^320390743 is an apocalyptic number.

320390743 is a deficient number, since it is larger than the sum of its proper divisors (2121945).

320390743 is a wasteful number, since it uses less digits than its factorization.

320390743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121944.

The product of its (nonzero) digits is 13608, while the sum is 31.

The square root of 320390743 is about 17899.4620868897. The cubic root of 320390743 is about 684.2686659032.

The spelling of 320390743 in words is "three hundred twenty million, three hundred ninety thousand, seven hundred forty-three".