31440000040 has 32 divisors (see below), whose sum is σ = 70942725000. Its totient is φ = 12539960064.

The previous prime is 31439999993. The next prime is 31440000041. The reversal of 31440000040 is 4000004413.

It can be written as a sum of positive squares in 4 ways, for example, as 27750895396 + 3689104644 = 166586^2 + 60738^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31439999969 and 31440000023.

It is not an unprimeable number, because it can be changed into a prime (31440000041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112115 + ... + 1140034.

Almost surely, 2^31440000040 is an apocalyptic number.

It is an amenable number.

31440000040 is an abundant number, since it is smaller than the sum of its proper divisors (39502724960).

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

31440000040 is a wasteful number, since it uses less digits than its factorization.

31440000040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252509 (or 2252505 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 31440000040 its reverse (4000004413), we get a palindrome (35440004453).

The spelling of 31440000040 in words is "thirty-one billion, four hundred forty million, forty", and thus it is an aban number.