423123131440 has 160 divisors (see below), whose sum is σ = 1007144913600. Its totient is φ = 165280186368.

The previous prime is 423123131429. The next prime is 423123131467. The reversal of 423123131440 is 44131321324.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 423123131399 and 423123131408.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 376778719 + ... + 376779841.

It is an arithmetic number, because the mean of its divisors is an integer number (6294655710).

Almost surely, 2^423123131440 is an apocalyptic number.

423123131440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 423123131440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (503572456800).

423123131440 is an abundant number, since it is smaller than the sum of its proper divisors (584021782160).

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

423123131440 is a wasteful number, since it uses less digits than its factorization.

423123131440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791 (or 1785 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 423123131440 its reverse (44131321324), we get a palindrome (467254452764).

The spelling of 423123131440 in words is "four hundred twenty-three billion, one hundred twenty-three million, one hundred thirty-one thousand, four hundred forty".