39947437885 has 16 divisors (see below), whose sum is σ = 48331855872. Its totient is φ = 31694846400.

The previous prime is 39947437819. The next prime is 39947437949. The reversal of 39947437885 is 58873474993.

39947437885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 39947437885 - 2²¹ = 39945340733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39947437885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2035570 + ... + 2055100.

It is an arithmetic number, because the mean of its divisors is an integer number (3020740992).

Almost surely, 2^39947437885 is an apocalyptic number.

It is an amenable number.

39947437885 is a deficient number, since it is larger than the sum of its proper divisors (8384417987).

39947437885 is a wasteful number, since it uses less digits than its factorization.

39947437885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22884.

The product of its digits is 182891520, while the sum is 67.

The spelling of 39947437885 in words is "thirty-nine billion, nine hundred forty-seven million, four hundred thirty-seven thousand, eight hundred eighty-five".