42440123440 has 160 divisors (see below), whose sum is σ = 119664340992. Its totient is φ = 13785984000.

The previous prime is 42440123437. The next prime is 42440123441. The reversal of 42440123440 is 4432104424.

It is a junction number, because it is equal to n+sod(n) for n = 42440123399 and 42440123408.

It is not an unprimeable number, because it can be changed into a prime (42440123441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294805 + ... + 414475.

Almost surely, 2^42440123440 is an apocalyptic number.

42440123440 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 42440123440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59832170496).

42440123440 is an abundant number, since it is smaller than the sum of its proper divisors (77224217552).

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

42440123440 is a wasteful number, since it uses less digits than its factorization.

42440123440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119739 (or 119733 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 42440123440 its reverse (4432104424), we get a palindrome (46872227864).

The spelling of 42440123440 in words is "forty-two billion, four hundred forty million, one hundred twenty-three thousand, four hundred forty".