861936723 has 12 divisors (see below), whose sum is σ = 1266122520. Its totient is φ = 564884736.

The previous prime is 861936629. The next prime is 861936781. The reversal of 861936723 is 327639168.

861936723 is a `hidden beast` number, since 8 + 619 + 3 + 6 + 7 + 23 = 666.

It is not a de Polignac number, because 861936723 - 2⁹ = 861936211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861936223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 811086 + ... + 812147.

It is an arithmetic number, because the mean of its divisors is an integer number (105510210).

Almost surely, 2^861936723 is an apocalyptic number.

861936723 is a deficient number, since it is larger than the sum of its proper divisors (404185797).

861936723 is a wasteful number, since it uses less digits than its factorization.

861936723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623298 (or 1623295 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 861936723 is about 29358.7588804432. The cubic root of 861936723 is about 951.6818675932.

The spelling of 861936723 in words is "eight hundred sixty-one million, nine hundred thirty-six thousand, seven hundred twenty-three".