31783903940 has 12 divisors (see below), whose sum is σ = 66746198316. Its totient is φ = 12713561568.

The previous prime is 31783903933. The next prime is 31783903967. The reversal of 31783903940 is 4930938713.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18192074884 + 13591829056 = 134878^2 + 116584^2 .

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, 794597579 + ... + 794597618.

It is an arithmetic number, because the mean of its divisors is an integer number (5562183193).

Almost surely, 2^31783903940 is an apocalyptic number.

It is an amenable number.

31783903940 is an abundant number, since it is smaller than the sum of its proper divisors (34962294376).

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

31783903940 is a wasteful number, since it uses less digits than its factorization.

31783903940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589195206 (or 1589195204 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 31783903940 in words is "thirty-one billion, seven hundred eighty-three million, nine hundred three thousand, nine hundred forty".