861873 has 4 divisors (see below), whose sum is σ = 1149168. Its totient is φ = 574580.

The previous prime is 861871. The next prime is 861877. The reversal of 861873 is 378168.

861873 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861873 - 2¹ = 861871 is a prime.

It is a D-number.

It is a Curzon number.

861873 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (861871) 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, 143643 + ... + 143648.

It is an arithmetic number, because the mean of its divisors is an integer number (287292).

2⁸⁶¹⁸⁷³ is an apocalyptic number.

It is an amenable number.

861873 is a deficient number, since it is larger than the sum of its proper divisors (287295).

861873 is a wasteful number, since it uses less digits than its factorization.

861873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287294.

The product of its digits is 8064, while the sum is 33.

The square root of 861873 is about 928.3711542266. The cubic root of 861873 is about 95.1658414395.

The spelling of 861873 in words is "eight hundred sixty-one thousand, eight hundred seventy-three".