891888 has 40 divisors (see below), whose sum is σ = 2441808. Its totient is φ = 279552.

The previous prime is 891887. The next prime is 891889. The reversal of 891888 is 888198.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (891887) and next prime (891889).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891887) 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, 270 + ... + 1362.

2⁸⁹¹⁸⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1220904).

891888 is an abundant number, since it is smaller than the sum of its proper divisors (1549920).

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

891888 is a wasteful number, since it uses less digits than its factorization.

891888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121 (or 1115 counting only the distinct ones).

The product of its digits is 36864, while the sum is 42.

The square root of 891888 is about 944.3982210911. The cubic root of 891888 is about 96.2579866314.

The spelling of 891888 in words is "eight hundred ninety-one thousand, eight hundred eighty-eight".