853861 has 4 divisors (see below), whose sum is σ = 855712. Its totient is φ = 852012.

The previous prime is 853843. The next prime is 853873. The reversal of 853861 is 168358.

853861 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 168358 = 2 ⋅84179.

It is a cyclic number.

It is not a de Polignac number, because 853861 - 2⁷ = 853733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (859861) 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, 400 + ... + 1366.

It is an arithmetic number, because the mean of its divisors is an integer number (213928).

2⁸⁵³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

853861 is a deficient number, since it is larger than the sum of its proper divisors (1851).

853861 is an equidigital number, since it uses as much as digits as its factorization.

853861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850.

The product of its digits is 5760, while the sum is 31.

The square root of 853861 is about 924.0459945262. The cubic root of 853861 is about 94.8700346542.

The spelling of 853861 in words is "eight hundred fifty-three thousand, eight hundred sixty-one".