861843 has 4 divisors (see below), whose sum is σ = 1149128. Its totient is φ = 574560.

The previous prime is 861829. The next prime is 861853. The reversal of 861843 is 348168.

It is a happy number.

861843 is nontrivially palindromic in base 8.

861843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 861843 - 2¹⁰ = 860819 is a prime.

It is a super-3 number, since 3×861843³ = 1920462054043332321, which contains 333 as substring.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 861843.

It is not an unprimeable number, because it can be changed into a prime (861803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143638 + ... + 143643.

It is an arithmetic number, because the mean of its divisors is an integer number (287282).

2⁸⁶¹⁸⁴³ is an apocalyptic number.

861843 is a deficient number, since it is larger than the sum of its proper divisors (287285).

861843 is a wasteful number, since it uses less digits than its factorization.

861843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287284.

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

The square root of 861843 is about 928.3549967550. The cubic root of 861843 is about 95.1647372519.

The spelling of 861843 in words is "eight hundred sixty-one thousand, eight hundred forty-three".