39980729897 has 16 divisors (see below), whose sum is σ = 42766470720. Its totient is φ = 37244132352.

The previous prime is 39980729891. The next prime is 39980729939. The reversal of 39980729897 is 79892708993.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 39980729897 - 2²⁴ = 39963952681 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 39980729897.

It is not an unprimeable number, because it can be changed into a prime (39980729891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1405538 + ... + 1433700.

It is an arithmetic number, because the mean of its divisors is an integer number (2672904420).

Almost surely, 2^39980729897 is an apocalyptic number.

It is an amenable number.

39980729897 is a deficient number, since it is larger than the sum of its proper divisors (2785740823).

39980729897 is a wasteful number, since it uses less digits than its factorization.

39980729897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29032.

The product of its (nonzero) digits is 123451776, while the sum is 71.

The spelling of 39980729897 in words is "thirty-nine billion, nine hundred eighty million, seven hundred twenty-nine thousand, eight hundred ninety-seven".