31222240040 has 16 divisors (see below), whose sum is σ = 70250040180. Its totient is φ = 12488896000.

The previous prime is 31222239977. The next prime is 31222240079. The reversal of 31222240040 is 4004222213.

It can be written as a sum of positive squares in 2 ways, for example, as 29776263364 + 1445976676 = 172558^2 + 38026^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31222239994 and 31222240021.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390277961 + ... + 390278040.

Almost surely, 2^31222240040 is an apocalyptic number.

It is an amenable number.

31222240040 is an abundant number, since it is smaller than the sum of its proper divisors (39027800140).

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

31222240040 is a wasteful number, since it uses less digits than its factorization.

31222240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780556012 (or 780556008 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 31222240040 its reverse (4004222213), we get a palindrome (35226462253).

The spelling of 31222240040 in words is "thirty-one billion, two hundred twenty-two million, two hundred forty thousand, forty".