861731642 has 16 divisors (see below), whose sum is σ = 1309089600. Its totient is φ = 425383200.

The previous prime is 861731621. The next prime is 861731657. The reversal of 861731642 is 246137168.

It is a junction number, because it is equal to n+sod(n) for n = 861731596 and 861731605.

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, 128267 + ... + 134817.

It is an arithmetic number, because the mean of its divisors is an integer number (81818100).

Almost surely, 2^861731642 is an apocalyptic number.

861731642 is a deficient number, since it is larger than the sum of its proper divisors (447357958).

861731642 is a wasteful number, since it uses less digits than its factorization.

861731642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7381.

The product of its digits is 48384, while the sum is 38.

The square root of 861731642 is about 29355.2660011794. The cubic root of 861731642 is about 951.6063835717.

The spelling of 861731642 in words is "eight hundred sixty-one million, seven hundred thirty-one thousand, six hundred forty-two".