31938379540 has 24 divisors (see below), whose sum is σ = 67337821152. Its totient is φ = 12724452000.

The previous prime is 31938379523. The next prime is 31938379591. The reversal of 31938379540 is 4597383913.

It is a super-2 number, since 2×31938379540² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3176094 + ... + 3186133.

It is an arithmetic number, because the mean of its divisors is an integer number (2805742548).

Almost surely, 2^31938379540 is an apocalyptic number.

It is an amenable number.

31938379540 is an abundant number, since it is smaller than the sum of its proper divisors (35399441612).

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

31938379540 is a wasteful number, since it uses less digits than its factorization.

31938379540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6362487 (or 6362485 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 31938379540 in words is "thirty-one billion, nine hundred thirty-eight million, three hundred seventy-nine thousand, five hundred forty".