31211440040 has 32 divisors (see below), whose sum is σ = 76609899360. Its totient is φ = 11349614400.

The previous prime is 31211440027. The next prime is 31211440067. The reversal of 31211440040 is 4004411213.

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 = 31211439994 and 31211440021.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35467106 + ... + 35467985.

It is an arithmetic number, because the mean of its divisors is an integer number (2394059355).

Almost surely, 2^31211440040 is an apocalyptic number.

It is an amenable number.

31211440040 is an abundant number, since it is smaller than the sum of its proper divisors (45398459320).

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

31211440040 is a wasteful number, since it uses less digits than its factorization.

31211440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70935113 (or 70935109 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31211440040 its reverse (4004411213), we get a palindrome (35215851253).

The spelling of 31211440040 in words is "thirty-one billion, two hundred eleven million, four hundred forty thousand, forty".