861871726 has 16 divisors (see below), whose sum is σ = 1319346000. Its totient is φ = 422169408.

The previous prime is 861871723. The next prime is 861871727. The reversal of 861871726 is 627178168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861871721) 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, 1945 + ... + 41563.

It is an arithmetic number, because the mean of its divisors is an integer number (82459125).

Almost surely, 2^861871726 is an apocalyptic number.

861871726 is a deficient number, since it is larger than the sum of its proper divisors (457474274).

861871726 is a wasteful number, since it uses less digits than its factorization.

861871726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39843.

The product of its digits is 225792, while the sum is 46.

The square root of 861871726 is about 29357.6519156420. The cubic root of 861871726 is about 951.6579454886.

The spelling of 861871726 in words is "eight hundred sixty-one million, eight hundred seventy-one thousand, seven hundred twenty-six".