861886259 has 8 divisors (see below), whose sum is σ = 932587152. Its totient is φ = 791814240.

The previous prime is 861886241. The next prime is 861886261. The reversal of 861886259 is 952688168.

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

It is a cyclic number.

It is not a de Polignac number, because 861886259 - 2¹⁶ = 861820723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 861886259.

It is not an unprimeable number, because it can be changed into a prime (861886279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154364 + ... + 159849.

It is an arithmetic number, because the mean of its divisors is an integer number (116573394).

Almost surely, 2^861886259 is an apocalyptic number.

861886259 is a deficient number, since it is larger than the sum of its proper divisors (70700893).

861886259 is a wasteful number, since it uses less digits than its factorization.

861886259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314437.

The product of its digits is 1658880, while the sum is 53.

The square root of 861886259 is about 29357.8994309879. The cubic root of 861886259 is about 951.6632944544.

The spelling of 861886259 in words is "eight hundred sixty-one million, eight hundred eighty-six thousand, two hundred fifty-nine".