7923871865 has 16 divisors (see below), whose sum is σ = 11702949888. Its totient is φ = 5015549376.

The previous prime is 7923871861. The next prime is 7923871871. The reversal of 7923871865 is 5681783297.

It is a cyclic number.

It is not a de Polignac number, because 7923871865 - 2² = 7923871861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7923871865.

It is not an unprimeable number, because it can be changed into a prime (7923871861) 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, 8707097 + ... + 8708006.

It is an arithmetic number, because the mean of its divisors is an integer number (731434368).

Almost surely, 2^7923871865 is an apocalyptic number.

It is an amenable number.

7923871865 is a deficient number, since it is larger than the sum of its proper divisors (3779078023).

7923871865 is a wasteful number, since it uses less digits than its factorization.

7923871865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17415128.

The product of its digits is 5080320, while the sum is 56.

The square root of 7923871865 is about 89016.1326108925. The cubic root of 7923871865 is about 1993.6357584459.

The spelling of 7923871865 in words is "seven billion, nine hundred twenty-three million, eight hundred seventy-one thousand, eight hundred sixty-five".