891868 has 6 divisors (see below), whose sum is σ = 1560776. Its totient is φ = 445932.

The previous prime is 891859. The next prime is 891887. The reversal of 891868 is 868198.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 891868.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111480 + ... + 111487.

2⁸⁹¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

891868 is a deficient number, since it is larger than the sum of its proper divisors (668908).

891868 is a wasteful number, since it uses less digits than its factorization.

891868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222971 (or 222969 counting only the distinct ones).

The product of its digits is 27648, while the sum is 40.

The square root of 891868 is about 944.3876322782. The cubic root of 891868 is about 96.2572671187.

The spelling of 891868 in words is "eight hundred ninety-one thousand, eight hundred sixty-eight".