861982718 has 16 divisors (see below), whose sum is σ = 1338947280. Its totient is φ = 415697856.

The previous prime is 861982717. The next prime is 861982721. The reversal of 861982718 is 817289168.

It is a super-2 number, since 2×861982718² = 1486028412261335048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861982717) 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, 52721 + ... + 67107.

It is an arithmetic number, because the mean of its divisors is an integer number (83684205).

Almost surely, 2^861982718 is an apocalyptic number.

861982718 is a deficient number, since it is larger than the sum of its proper divisors (476964562).

861982718 is a wasteful number, since it uses less digits than its factorization.

861982718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15451.

The product of its digits is 387072, while the sum is 50.

The square root of 861982718 is about 29359.5421967033. The cubic root of 861982718 is about 951.6987952971.

The spelling of 861982718 in words is "eight hundred sixty-one million, nine hundred eighty-two thousand, seven hundred eighteen".