31440212340 has 48 divisors (see below), whose sum is σ = 88887297408. Its totient is φ = 8302656384.

The previous prime is 31440212311. The next prime is 31440212389. The reversal of 31440212340 is 4321204413.

It is a self number, because there is not a number n which added to its sum of digits gives 31440212340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2537527 + ... + 2549886.

It is an arithmetic number, because the mean of its divisors is an integer number (1851818696).

Almost surely, 2^31440212340 is an apocalyptic number.

31440212340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31440212340 is an abundant number, since it is smaller than the sum of its proper divisors (57447085068).

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

31440212340 is a wasteful number, since it uses less digits than its factorization.

31440212340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5087528 (or 5087526 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31440212340 its reverse (4321204413), we get a palindrome (35761416753).

The spelling of 31440212340 in words is "thirty-one billion, four hundred forty million, two hundred twelve thousand, three hundred forty".