868815138 has 16 divisors (see below), whose sum is σ = 1737951840. Its totient is φ = 289551456.

The previous prime is 868815137. The next prime is 868815151. The reversal of 868815138 is 831518868.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (868815137) 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, 35398 + ... + 54686.

It is an arithmetic number, because the mean of its divisors is an integer number (108621990).

Almost surely, 2^868815138 is an apocalyptic number.

868815138 is an abundant number, since it is smaller than the sum of its proper divisors (869136702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

868815138 is a wasteful number, since it uses less digits than its factorization.

868815138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26801.

The product of its digits is 368640, while the sum is 48.

The square root of 868815138 is about 29475.6702722771. The cubic root of 868815138 is about 954.2066958928.

The spelling of 868815138 in words is "eight hundred sixty-eight million, eight hundred fifteen thousand, one hundred thirty-eight".