891216 has 40 divisors (see below), whose sum is σ = 2559360. Its totient is φ = 296928.

The previous prime is 891179. The next prime is 891223. The reversal of 891216 is 612198.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 891216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 600 + ... + 1463.

It is an arithmetic number, because the mean of its divisors is an integer number (63984).

2⁸⁹¹²¹⁶ is an apocalyptic number.

It is an amenable number.

891216 is an abundant number, since it is smaller than the sum of its proper divisors (1668144).

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

891216 is a wasteful number, since it uses less digits than its factorization.

891216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080 (or 2068 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 891216 is about 944.0423719304. The cubic root of 891216 is about 96.2338051124.

The spelling of 891216 in words is "eight hundred ninety-one thousand, two hundred sixteen".