320423420440 has 32 divisors (see below), whose sum is σ = 720970134480. Its totient is φ = 128166268032.

The previous prime is 320423420419. The next prime is 320423420441. The reversal of 320423420440 is 44024324023.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 320423420399 and 320423420408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320423420441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2324899 + ... + 2458861.

Almost surely, 2^320423420440 is an apocalyptic number.

It is an amenable number.

320423420440 is an abundant number, since it is smaller than the sum of its proper divisors (400546714040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320423420440 is a wasteful number, since it uses less digits than its factorization.

320423420440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193771 (or 193767 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 320423420440 its reverse (44024324023), we get a palindrome (364447744463).

The spelling of 320423420440 in words is "three hundred twenty billion, four hundred twenty-three million, four hundred twenty thousand, four hundred forty".