115868889 has 24 divisors (see below), whose sum is σ = 177844680. Its totient is φ = 72442368.

The previous prime is 115868887. The next prime is 115868903. The reversal of 115868889 is 988868511.

It can be written as a sum of positive squares in 4 ways, for example, as 1742400 + 114126489 = 1320^2 + 10683^2 .

It is not a de Polignac number, because 115868889 - 2¹ = 115868887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115868881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47307 + ... + 49695.

It is an arithmetic number, because the mean of its divisors is an integer number (7410195).

Almost surely, 2^115868889 is an apocalyptic number.

It is an amenable number.

115868889 is a deficient number, since it is larger than the sum of its proper divisors (61975791).

115868889 is a wasteful number, since it uses less digits than its factorization.

115868889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729 (or 2726 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 54.

The square root of 115868889 is about 10764.2412180330. The cubic root of 115868889 is about 487.5160830986.

The spelling of 115868889 in words is "one hundred fifteen million, eight hundred sixty-eight thousand, eight hundred eighty-nine".