861928 has 8 divisors (see below), whose sum is σ = 1616130. Its totient is φ = 430960.

The previous prime is 861907. The next prime is 861929. The reversal of 861928 is 829168.

861928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 550564 + 311364 = 742^2 + 558^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 861893 and 861902.

It is not an unprimeable number, because it can be changed into a prime (861929) by changing a digit.

861928 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53863 + ... + 53878.

2⁸⁶¹⁹²⁸ is an apocalyptic number.

It is an amenable number.

861928 is a deficient number, since it is larger than the sum of its proper divisors (754202).

861928 is a wasteful number, since it uses less digits than its factorization.

861928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107747 (or 107743 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 861928 is about 928.4007755275. The cubic root of 861928 is about 95.1678657168.

The spelling of 861928 in words is "eight hundred sixty-one thousand, nine hundred twenty-eight".