39912920905 has 16 divisors (see below), whose sum is σ = 56268846144. Its totient is φ = 26794687680.

The previous prime is 39912920897. The next prime is 39912920959. The reversal of 39912920905 is 50902921993.

It is a happy number.

It is not a de Polignac number, because 39912920905 - 2³ = 39912920897 is a prime.

It is a Duffinian 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, 27910419 + ... + 27911848.

It is an arithmetic number, because the mean of its divisors is an integer number (3516802884).

Almost surely, 2^39912920905 is an apocalyptic number.

It is an amenable number.

39912920905 is a deficient number, since it is larger than the sum of its proper divisors (16355925239).

39912920905 is a wasteful number, since it uses less digits than its factorization.

39912920905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55822296.

The product of its (nonzero) digits is 393660, while the sum is 49.

The spelling of 39912920905 in words is "thirty-nine billion, nine hundred twelve million, nine hundred twenty thousand, nine hundred five".