31440404112440 has 32 divisors (see below), whose sum is σ = 70778121896160. Its totient is φ = 12569546064000.

The previous prime is 31440404112431. The next prime is 31440404112457. The reversal of 31440404112440 is 4421140404413.

It is a junction number, because it is equal to n+sod(n) for n = 31440404112397 and 31440404112406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206659916 + ... + 206811995.

It is an arithmetic number, because the mean of its divisors is an integer number (2211816309255).

Almost surely, 2^{31440404112440} is an apocalyptic number.

It is an amenable number.

31440404112440 is an abundant number, since it is smaller than the sum of its proper divisors (39337717783720).

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

31440404112440 is a wasteful number, since it uses less digits than its factorization.

31440404112440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413473823 (or 413473819 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 32.

Adding to 31440404112440 its reverse (4421140404413), we get a palindrome (35861544516853).

The spelling of 31440404112440 in words is "thirty-one trillion, four hundred forty billion, four hundred four million, one hundred twelve thousand, four hundred forty".