39509485721 has 8 divisors (see below), whose sum is σ = 41232459840. Its totient is φ = 37786942512.

The previous prime is 39509485699. The next prime is 39509485733. The reversal of 39509485721 is 12758490593.

39509485721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 39509485721 - 2⁶ = 39509485657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39509415721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87170 + ... + 294308.

It is an arithmetic number, because the mean of its divisors is an integer number (5154057480).

Almost surely, 2^39509485721 is an apocalyptic number.

It is an amenable number.

39509485721 is a deficient number, since it is larger than the sum of its proper divisors (1722974119).

39509485721 is a wasteful number, since it uses less digits than its factorization.

39509485721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215455.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 39509485721 in words is "thirty-nine billion, five hundred nine million, four hundred eighty-five thousand, seven hundred twenty-one".