891912 has 32 divisors (see below), whose sum is σ = 2548800. Its totient is φ = 254784.

The previous prime is 891907. The next prime is 891923. The reversal of 891912 is 219198.

It is a self number, because there is not a number n which added to its sum of digits gives 891912.

It is a congruent number.

It is an unprimeable number.

891912 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2487 + ... + 2822.

It is an arithmetic number, because the mean of its divisors is an integer number (79650).

2⁸⁹¹⁹¹² is an apocalyptic number.

It is an amenable number.

891912 is an abundant number, since it is smaller than the sum of its proper divisors (1656888).

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

891912 is a wasteful number, since it uses less digits than its factorization.

891912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325 (or 5321 counting only the distinct ones).

The product of its digits is 1296, while the sum is 30.

The square root of 891912 is about 944.4109275098. The cubic root of 891912 is about 96.2588500324.

The spelling of 891912 in words is "eight hundred ninety-one thousand, nine hundred twelve".