855803 has 4 divisors (see below), whose sum is σ = 921648. Its totient is φ = 789960.

The previous prime is 855787. The next prime is 855821. The reversal of 855803 is 308558.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 308558 = 2 ⋅154279.

It is a cyclic number.

It is not a de Polignac number, because 855803 - 2⁴ = 855787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32903 + ... + 32928.

It is an arithmetic number, because the mean of its divisors is an integer number (230412).

2⁸⁵⁵⁸⁰³ is an apocalyptic number.

855803 is a deficient number, since it is larger than the sum of its proper divisors (65845).

855803 is a wasteful number, since it uses less digits than its factorization.

855803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65844.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 855803 is about 925.0962112127. The cubic root of 855803 is about 94.9419035370.

The spelling of 855803 in words is "eight hundred fifty-five thousand, eight hundred three".