891018 has 24 divisors (see below), whose sum is σ = 1965600. Its totient is φ = 291624.

The previous prime is 891017. The next prime is 891047. The reversal of 891018 is 810198.

It is a junction number, because it is equal to n+sod(n) for n = 890982 and 891000.

It is not an unprimeable number, because it can be changed into a prime (891017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 643 + ... + 1481.

It is an arithmetic number, because the mean of its divisors is an integer number (81900).

2⁸⁹¹⁰¹⁸ is an apocalyptic number.

891018 is an abundant number, since it is smaller than the sum of its proper divisors (1074582).

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

891018 is a wasteful number, since it uses less digits than its factorization.

891018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906 (or 903 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 891018 is about 943.9374979309. The cubic root of 891018 is about 96.2266778822.

The spelling of 891018 in words is "eight hundred ninety-one thousand, eighteen".