39896684865 has 80 divisors (see below), whose sum is σ = 72393235200. Its totient is φ = 21019056768.

The previous prime is 39896684857. The next prime is 39896684881. The reversal of 39896684865 is 56848669893.

39896684865 is a `hidden beast` number, since 3 + 9 + 89 + 6 + 68 + 486 + 5 = 666.

It is not a de Polignac number, because 39896684865 - 2³ = 39896684857 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 39896684793 and 39896684802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 21231996 + ... + 21233874.

It is an arithmetic number, because the mean of its divisors is an integer number (904915440).

Almost surely, 2^39896684865 is an apocalyptic number.

It is an amenable number.

39896684865 is a deficient number, since it is larger than the sum of its proper divisors (32496550335).

39896684865 is a wasteful number, since it uses less digits than its factorization.

39896684865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2508 (or 2499 counting only the distinct ones).

The product of its digits is 537477120, while the sum is 72.

The spelling of 39896684865 in words is "thirty-nine billion, eight hundred ninety-six million, six hundred eighty-four thousand, eight hundred sixty-five".