861938 has 32 divisors (see below), whose sum is σ = 1676160. Its totient is φ = 322560.

The previous prime is 861937. The next prime is 861941. The reversal of 861938 is 839168.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 861898 and 861907.

It is not an unprimeable number, because it can be changed into a prime (861937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4370 + ... + 4562.

It is an arithmetic number, because the mean of its divisors is an integer number (52380).

2⁸⁶¹⁹³⁸ is an apocalyptic number.

861938 is a deficient number, since it is larger than the sum of its proper divisors (814222).

861938 is a wasteful number, since it uses less digits than its factorization.

861938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242.

The product of its digits is 10368, while the sum is 35.

The square root of 861938 is about 928.4061611170. The cubic root of 861938 is about 95.1682337580.

The spelling of 861938 in words is "eight hundred sixty-one thousand, nine hundred thirty-eight".