31407971838 has 16 divisors (see below), whose sum is σ = 62909288976. Its totient is φ = 10453766400.

The previous prime is 31407971821. The next prime is 31407971849. The reversal of 31407971838 is 83817970413.

It is a congruent number.

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, 3885013 + ... + 3893088.

It is an arithmetic number, because the mean of its divisors is an integer number (3931830561).

Almost surely, 2^31407971838 is an apocalyptic number.

31407971838 is an abundant number, since it is smaller than the sum of its proper divisors (31501317138).

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

31407971838 is a wasteful number, since it uses less digits than its factorization.

31407971838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7778779.

The product of its (nonzero) digits is 1016064, while the sum is 51.

The spelling of 31407971838 in words is "thirty-one billion, four hundred seven million, nine hundred seventy-one thousand, eight hundred thirty-eight".