39945979008 has 1024 divisors, whose sum is σ = 144764928000. Its totient is φ = 10729635840.

The previous prime is 39945978971. The next prime is 39945979013. The reversal of 39945979008 is 80097954993.

It is a happy number.

39945979008 is a `hidden beast` number, since 3 + 99 + 459 + 7 + 90 + 0 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 928976235 + ... + 928976277.

It is an arithmetic number, because the mean of its divisors is an integer number (141372000).

Almost surely, 2^39945979008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39945979008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72382464000).

39945979008 is an abundant number, since it is smaller than the sum of its proper divisors (104818948992).

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

39945979008 is a wasteful number, since it uses less digits than its factorization.

39945979008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 63.

The spelling of 39945979008 in words is "thirty-nine billion, nine hundred forty-five million, nine hundred seventy-nine thousand, eight".