7935716821 has 8 divisors (see below), whose sum is σ = 8212415904. Its totient is φ = 7662292560.

The previous prime is 7935716809. The next prime is 7935716839. The reversal of 7935716821 is 1286175397.

It is a happy number.

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 7935716821 - 2²⁷ = 7801499093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7935716851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 813775 + ... + 823468.

It is an arithmetic number, because the mean of its divisors is an integer number (1026551988).

Almost surely, 2^7935716821 is an apocalyptic number.

It is an amenable number.

7935716821 is a deficient number, since it is larger than the sum of its proper divisors (276699083).

7935716821 is a wasteful number, since it uses less digits than its factorization.

7935716821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637411.

The product of its digits is 635040, while the sum is 49.

The square root of 7935716821 is about 89082.6404020447. The cubic root of 7935716821 is about 1994.6286556609.

The spelling of 7935716821 in words is "seven billion, nine hundred thirty-five million, seven hundred sixteen thousand, eight hundred twenty-one".