891855 has 12 divisors (see below), whose sum is σ = 1545960. Its totient is φ = 475632.

The previous prime is 891851. The next prime is 891859. The reversal of 891855 is 558198.

It is an interprime number because it is at equal distance from previous prime (891851) and next prime (891859).

It is not a de Polignac number, because 891855 - 2² = 891851 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9865 + ... + 9954.

It is an arithmetic number, because the mean of its divisors is an integer number (128830).

2⁸⁹¹⁸⁵⁵ is an apocalyptic number.

891855 is a deficient number, since it is larger than the sum of its proper divisors (654105).

891855 is a wasteful number, since it uses less digits than its factorization.

891855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19830 (or 19827 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 891855 is about 944.3807494861. The cubic root of 891855 is about 96.2567994297.

The spelling of 891855 in words is "eight hundred ninety-one thousand, eight hundred fifty-five".