891816 has 16 divisors (see below), whose sum is σ = 2229600. Its totient is φ = 297264.

The previous prime is 891809. The next prime is 891817. The reversal of 891816 is 618198.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (891817) by changing a digit.

891816 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18556 + ... + 18603.

It is an arithmetic number, because the mean of its divisors is an integer number (139350).

2⁸⁹¹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

891816 is an abundant number, since it is smaller than the sum of its proper divisors (1337784).

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

891816 is a wasteful number, since it uses less digits than its factorization.

891816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37168 (or 37164 counting only the distinct ones).

The product of its digits is 3456, while the sum is 33.

The square root of 891816 is about 944.3601008090. The cubic root of 891816 is about 96.2553963354.

The spelling of 891816 in words is "eight hundred ninety-one thousand, eight hundred sixteen".