31440042444 has 96 divisors (see below), whose sum is σ = 79282748160. Its totient is φ = 9666259200.

The previous prime is 31440042299. The next prime is 31440042461. The reversal of 31440042444 is 44424004413.

31440042444 is a modest number, since divided by 42444 gives 31440 as remainder.

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, 1573074 + ... + 1592934.

It is an arithmetic number, because the mean of its divisors is an integer number (825861960).

Almost surely, 2^31440042444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31440042444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39641374080).

31440042444 is an abundant number, since it is smaller than the sum of its proper divisors (47842705716).

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

31440042444 is a wasteful number, since it uses less digits than its factorization.

31440042444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20071 (or 20069 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 31440042444 its reverse (44424004413), we get a palindrome (75864046857).

The spelling of 31440042444 in words is "thirty-one billion, four hundred forty million, forty-two thousand, four hundred forty-four".