39983979840 has 224 divisors, whose sum is σ = 145841191680. Its totient is φ = 9091547136.

The previous prime is 39983979839. The next prime is 39983979859. The reversal of 39983979840 is 4897938993.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

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, 1281546 + ... + 1312374.

Almost surely, 2^39983979840 is an apocalyptic number.

39983979840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39983979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72920595840).

39983979840 is an abundant number, since it is smaller than the sum of its proper divisors (105857211840).

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

39983979840 is a wasteful number, since it uses less digits than its factorization.

39983979840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31049 (or 31039 counting only the distinct ones).

The product of its (nonzero) digits is 105815808, while the sum is 69.

The spelling of 39983979840 in words is "thirty-nine billion, nine hundred eighty-three million, nine hundred seventy-nine thousand, eight hundred forty".