861238115 has 8 divisors (see below), whose sum is σ = 1039460688. Its totient is φ = 685007200.

The previous prime is 861238111. The next prime is 861238117. The reversal of 861238115 is 511832168.

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

It is not a de Polignac number, because 861238115 - 2² = 861238111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861238111) 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, 496961 + ... + 498690.

It is an arithmetic number, because the mean of its divisors is an integer number (129932586).

Almost surely, 2^861238115 is an apocalyptic number.

861238115 is a deficient number, since it is larger than the sum of its proper divisors (178222573).

861238115 is a wasteful number, since it uses less digits than its factorization.

861238115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995829.

The product of its digits is 11520, while the sum is 35.

The square root of 861238115 is about 29346.8586904970. The cubic root of 861238115 is about 951.4246823295.

The spelling of 861238115 in words is "eight hundred sixty-one million, two hundred thirty-eight thousand, one hundred fifteen".