891198 has 48 divisors (see below), whose sum is σ = 2411136. Its totient is φ = 231120.

The previous prime is 891179. The next prime is 891223.

891198 is nontrivially palindromic in base 10.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1065 + ... + 1707.

It is an arithmetic number, because the mean of its divisors is an integer number (50232).

2⁸⁹¹¹⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1205568).

891198 is an abundant number, since it is smaller than the sum of its proper divisors (1519938).

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

891198 is a wasteful number, since it uses less digits than its factorization.

891198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 666 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 891198 is about 944.0328384119. The cubic root of 891198 is about 96.2331572260.

It can be divided in two parts, 8911 and 98, that added together give a palindrome (9009).

The spelling of 891198 in words is "eight hundred ninety-one thousand, one hundred ninety-eight".