39891612385 has 8 divisors (see below), whose sum is σ = 47871752616. Its totient is φ = 31912078080.

The previous prime is 39891612379. The next prime is 39891612427. The reversal of 39891612385 is 58321619893.

39891612385 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 4 ways, for example, as 2134070416 + 37757541969 = 46196^2 + 194313^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39891612385 - 2²⁹ = 39354741473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8775 + ... + 282595.

It is an arithmetic number, because the mean of its divisors is an integer number (5983969077).

Almost surely, 2^39891612385 is an apocalyptic number.

It is an amenable number.

39891612385 is a deficient number, since it is larger than the sum of its proper divisors (7980140231).

39891612385 is a wasteful number, since it uses less digits than its factorization.

39891612385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302963.

The product of its digits is 2799360, while the sum is 55.

The spelling of 39891612385 in words is "thirty-nine billion, eight hundred ninety-one million, six hundred twelve thousand, three hundred eighty-five".