861822812 has 24 divisors (see below), whose sum is σ = 1568854560. Its totient is φ = 413743680.

The previous prime is 861822791. The next prime is 861822839. The reversal of 861822812 is 218228168.

It is a congruent number.

It is an unprimeable number.

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, 473 + ... + 41519.

It is an arithmetic number, because the mean of its divisors is an integer number (65368940).

Almost surely, 2^861822812 is an apocalyptic number.

It is an amenable number.

861822812 is a deficient number, since it is larger than the sum of its proper divisors (707031748).

861822812 is a wasteful number, since it uses less digits than its factorization.

861822812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41261 (or 41259 counting only the distinct ones).

The product of its digits is 24576, while the sum is 38.

The square root of 861822812 is about 29356.8188331093. The cubic root of 861822812 is about 951.6399419289.

The spelling of 861822812 in words is "eight hundred sixty-one million, eight hundred twenty-two thousand, eight hundred twelve".