861805950 has 48 divisors (see below), whose sum is σ = 2139706800. Its totient is φ = 229553920.

The previous prime is 861805907. The next prime is 861805951. The reversal of 861805950 is 59508168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861805951) 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 23 ways as a sum of consecutive naturals, for example, 154612 + ... + 160088.

It is an arithmetic number, because the mean of its divisors is an integer number (44577225).

Almost surely, 2^861805950 is an apocalyptic number.

861805950 is an abundant number, since it is smaller than the sum of its proper divisors (1277900850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861805950 is a wasteful number, since it uses less digits than its factorization.

861805950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6541 (or 6536 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 861805950 is about 29356.5316411868. The cubic root of 861805950 is about 951.6337354492.

The spelling of 861805950 in words is "eight hundred sixty-one million, eight hundred five thousand, nine hundred fifty".