855618 has 16 divisors (see below), whose sum is σ = 1740960. Its totient is φ = 280256.

The previous prime is 855607. The next prime is 855619. The reversal of 855618 is 816558.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (855619) 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, 855 + ... + 1562.

It is an arithmetic number, because the mean of its divisors is an integer number (108810).

2⁸⁵⁵⁶¹⁸ is an apocalyptic number.

855618 is an abundant number, since it is smaller than the sum of its proper divisors (885342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

855618 is a wasteful number, since it uses less digits than its factorization.

855618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481.

The product of its digits is 9600, while the sum is 33.

The square root of 855618 is about 924.9962162085. The cubic root of 855618 is about 94.9350618075.

Subtracting from 855618 its reverse (816558), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 855618 in words is "eight hundred fifty-five thousand, six hundred eighteen".