859873 has 4 divisors (see below), whose sum is σ = 982720. Its totient is φ = 737028.

The previous prime is 859861. The next prime is 859891. The reversal of 859873 is 378958.

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, and also an emirpimes, since its reverse is a distinct semiprime: 378958 = 2 ⋅189479.

It is a cyclic number.

It is not a de Polignac number, because 859873 - 2⁵ = 859841 is a prime.

It is a super-2 number, since 2×859873² = 1478763152258, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (859823) 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 3 ways as a sum of consecutive naturals, for example, 61413 + ... + 61426.

It is an arithmetic number, because the mean of its divisors is an integer number (245680).

2⁸⁵⁹⁸⁷³ is an apocalyptic number.

It is an amenable number.

859873 is a deficient number, since it is larger than the sum of its proper divisors (122847).

859873 is a wasteful number, since it uses less digits than its factorization.

859873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122846.

The product of its digits is 60480, while the sum is 40.

The square root of 859873 is about 927.2933732104. The cubic root of 859873 is about 95.0921727759.

The spelling of 859873 in words is "eight hundred fifty-nine thousand, eight hundred seventy-three".