861834 has 16 divisors (see below), whose sum is σ = 1733760. Its totient is φ = 285600.

The previous prime is 861829. The next prime is 861853. The reversal of 861834 is 438168.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

861834 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 7 ways as a sum of consecutive naturals, for example, 1134 + ... + 1734.

It is an arithmetic number, because the mean of its divisors is an integer number (108360).

2⁸⁶¹⁸³⁴ is an apocalyptic number.

861834 is an abundant number, since it is smaller than the sum of its proper divisors (871926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861834 is a wasteful number, since it uses less digits than its factorization.

861834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845.

The product of its digits is 4608, while the sum is 30.

The square root of 861834 is about 928.3501494587. The cubic root of 861834 is about 95.1644059907.

The spelling of 861834 in words is "eight hundred sixty-one thousand, eight hundred thirty-four".