855789 has 8 divisors (see below), whose sum is σ = 1244832. Its totient is φ = 518640.

The previous prime is 855787. The next prime is 855821. The reversal of 855789 is 987558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 855789 - 2¹ = 855787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 855789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12934 + ... + 12999.

It is an arithmetic number, because the mean of its divisors is an integer number (155604).

2⁸⁵⁵⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

855789 is a deficient number, since it is larger than the sum of its proper divisors (389043).

855789 is a wasteful number, since it uses less digits than its factorization.

855789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25947.

The product of its digits is 100800, while the sum is 42.

The square root of 855789 is about 925.0886444012. The cubic root of 855789 is about 94.9413858190.

Subtracting 855789 from its reverse (987558), we obtain a square (131769 = 363²).

It can be divided in two parts, 8557 and 89, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 855789 in words is "eight hundred fifty-five thousand, seven hundred eighty-nine".