39981671940 has 96 divisors (see below), whose sum is σ = 129743437824. Its totient is φ = 9009947520.

The previous prime is 39981671929. The next prime is 39981671959. The reversal of 39981671940 is 4917618993.

It is a super-2 number, since 2×39981671940² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 640564 + ... + 700203.

It is an arithmetic number, because the mean of its divisors is an integer number (1351494144).

Almost surely, 2^39981671940 is an apocalyptic number.

39981671940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

39981671940 is an abundant number, since it is smaller than the sum of its proper divisors (89761765884).

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

39981671940 is a wasteful number, since it uses less digits than its factorization.

39981671940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340857 (or 1340855 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 57.

The spelling of 39981671940 in words is "thirty-nine billion, nine hundred eighty-one million, six hundred seventy-one thousand, nine hundred forty".