39789649857 has 8 divisors (see below), whose sum is σ = 53844700576. Its totient is φ = 26130516192.

The previous prime is 39789649853. The next prime is 39789649903. The reversal of 39789649857 is 75894698793.

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

It is not a de Polignac number, because 39789649857 - 2² = 39789649853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39789649853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98979028 + ... + 98979429.

It is an arithmetic number, because the mean of its divisors is an integer number (6730587572).

Almost surely, 2^39789649857 is an apocalyptic number.

It is an amenable number.

39789649857 is a deficient number, since it is larger than the sum of its proper divisors (14055050719).

39789649857 is a wasteful number, since it uses less digits than its factorization.

39789649857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197958527.

The product of its digits is 823011840, while the sum is 75.

The spelling of 39789649857 in words is "thirty-nine billion, seven hundred eighty-nine million, six hundred forty-nine thousand, eight hundred fifty-seven".