855815 has 4 divisors (see below), whose sum is σ = 1026984. Its totient is φ = 684648.

The previous prime is 855787. The next prime is 855821. The reversal of 855815 is 518558.

855815 is nontrivially palindromic in base 4.

855815 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855815 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 855815.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85577 + ... + 85586.

It is an arithmetic number, because the mean of its divisors is an integer number (256746).

2⁸⁵⁵⁸¹⁵ is an apocalyptic number.

855815 is a deficient number, since it is larger than the sum of its proper divisors (171169).

855815 is a wasteful number, since it uses less digits than its factorization.

855815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171168.

The product of its digits is 8000, while the sum is 32.

The square root of 855815 is about 925.1026970018. The cubic root of 855815 is about 94.9423472908.

The spelling of 855815 in words is "eight hundred fifty-five thousand, eight hundred fifteen".