39845401640 has 256 divisors, whose sum is σ = 102001213440. Its totient is φ = 14001926400.

The previous prime is 39845401591. The next prime is 39845401691. The reversal of 39845401640 is 4610454893.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 39845401591 and 39845401600.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 313743257 + ... + 313743383.

It is an arithmetic number, because the mean of its divisors is an integer number (398442240).

Almost surely, 2^39845401640 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 39845401640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51000606720).

39845401640 is an abundant number, since it is smaller than the sum of its proper divisors (62155811800).

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

39845401640 is a wasteful number, since it uses less digits than its factorization.

39845401640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 39845401640 in words is "thirty-nine billion, eight hundred forty-five million, four hundred one thousand, six hundred forty".