7859138889 has 8 divisors (see below), whose sum is σ = 11975830720. Its totient is φ = 4490936496.

The previous prime is 7859138869. The next prime is 7859138971. The reversal of 7859138889 is 9888319587.

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

It is not a de Polignac number, because 7859138889 - 2¹⁵ = 7859106121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7859138869) 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, 187122334 + ... + 187122375.

It is an arithmetic number, because the mean of its divisors is an integer number (1496978840).

Almost surely, 2^7859138889 is an apocalyptic number.

It is an amenable number.

7859138889 is a deficient number, since it is larger than the sum of its proper divisors (4116691831).

7859138889 is a wasteful number, since it uses less digits than its factorization.

7859138889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374244719.

The product of its digits is 34836480, while the sum is 66.

The square root of 7859138889 is about 88651.7844659655. The cubic root of 7859138889 is about 1988.1919968118.

The spelling of 7859138889 in words is "seven billion, eight hundred fifty-nine million, one hundred thirty-eight thousand, eight hundred eighty-nine".