861838 has 8 divisors (see below), whose sum is σ = 1310688. Its totient is φ = 424944.

The previous prime is 861829. The next prime is 861853. The reversal of 861838 is 838168.

861838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

861838 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 in 3 ways as a sum of consecutive naturals, for example, 2806 + ... + 3097.

It is an arithmetic number, because the mean of its divisors is an integer number (163836).

2⁸⁶¹⁸³⁸ is an apocalyptic number.

861838 is a deficient number, since it is larger than the sum of its proper divisors (448850).

861838 is a wasteful number, since it uses less digits than its factorization.

861838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5978.

The product of its digits is 9216, while the sum is 34.

The square root of 861838 is about 928.3523038157. The cubic root of 861838 is about 95.1645532182.

The spelling of 861838 in words is "eight hundred sixty-one thousand, eight hundred thirty-eight".