39805439858 has 18 divisors (see below), whose sum is σ = 60591458223. Its totient is φ = 19612524540.

The previous prime is 39805439851. The next prime is 39805439903. The reversal of 39805439858 is 85893450893.

39805439858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 19902719929 + 19902719929 = 141077^2 + 141077^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=141077.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 39805439858.

It is not an unprimeable number, because it can be changed into a prime (39805439851) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20031941 + ... + 20033927.

Almost surely, 2^39805439858 is an apocalyptic number.

39805439858 is a deficient number, since it is larger than the sum of its proper divisors (20786018365).

39805439858 is an frugal number, since it uses more digits than its factorization.

39805439858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4118 (or 2060 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 62.

The spelling of 39805439858 in words is "thirty-nine billion, eight hundred five million, four hundred thirty-nine thousand, eight hundred fifty-eight".