891224 has 16 divisors (see below), whose sum is σ = 1689120. Its totient is φ = 440800.

The previous prime is 891223. The next prime is 891239. The reversal of 891224 is 422198.

891224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 891193 and 891202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257 + ... + 1359.

It is an arithmetic number, because the mean of its divisors is an integer number (105570).

2⁸⁹¹²²⁴ is an apocalyptic number.

It is an amenable number.

891224 is a deficient number, since it is larger than the sum of its proper divisors (797896).

891224 is a wasteful number, since it uses less digits than its factorization.

891224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210 (or 1206 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 891224 is about 944.0466090189. The cubic root of 891224 is about 96.2340930591.

Subtracting from 891224 its sum of digits (26), we obtain a palindrome (891198).

The spelling of 891224 in words is "eight hundred ninety-one thousand, two hundred twenty-four".