3935136721 has 8 divisors (see below), whose sum is σ = 4142832320. Its totient is φ = 3727499472.

The previous prime is 3935136671. The next prime is 3935136743. The reversal of 3935136721 is 1276315393.

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

It is a cyclic number.

It is not a de Polignac number, because 3935136721 - 2⁷ = 3935136593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3935130721) 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, 224356 + ... + 241258.

It is an arithmetic number, because the mean of its divisors is an integer number (517854040).

Almost surely, 2^3935136721 is an apocalyptic number.

It is an amenable number.

3935136721 is a deficient number, since it is larger than the sum of its proper divisors (207695599).

3935136721 is a wasteful number, since it uses less digits than its factorization.

3935136721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29175.

The product of its digits is 102060, while the sum is 40.

The square root of 3935136721 is about 62730.6681057997. The cubic root of 3935136721 is about 1578.7739140715.

The spelling of 3935136721 in words is "three billion, nine hundred thirty-five million, one hundred thirty-six thousand, seven hundred twenty-one".