320423993 has 2 divisors, whose sum is σ = 320423994. Its totient is φ = 320423992.

The previous prime is 320423977. The next prime is 320424001. The reversal of 320423993 is 399324023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179479609 + 140944384 = 13397^2 + 11872^2 .

It is a cyclic number.

It is not a de Polignac number, because 320423993 - 2⁴ = 320423977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320423953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160211996 + 160211997.

It is an arithmetic number, because the mean of its divisors is an integer number (160211997).

Almost surely, 2^320423993 is an apocalyptic number.

It is an amenable number.

320423993 is a deficient number, since it is larger than the sum of its proper divisors (1).

320423993 is an equidigital number, since it uses as much as digits as its factorization.

320423993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 35.

The square root of 320423993 is about 17900.3908616544. The cubic root of 320423993 is about 684.2923361107.

The spelling of 320423993 in words is "three hundred twenty million, four hundred twenty-three thousand, nine hundred ninety-three".