861982850 has 12 divisors (see below), whose sum is σ = 1603288194. Its totient is φ = 344793120.

The previous prime is 861982789. The next prime is 861982903. The reversal of 861982850 is 58289168.

It can be written as a sum of positive squares in 3 ways, for example, as 471801841 + 390181009 = 21721^2 + 19753^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 861982795 and 861982804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8619779 + ... + 8619878.

Almost surely, 2^861982850 is an apocalyptic number.

861982850 is a deficient number, since it is larger than the sum of its proper divisors (741305344).

861982850 is a wasteful number, since it uses less digits than its factorization.

861982850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17239669 (or 17239664 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 861982850 is about 29359.5444446946. The cubic root of 861982850 is about 951.6988438767.

The spelling of 861982850 in words is "eight hundred sixty-one million, nine hundred eighty-two thousand, eight hundred fifty".