811998 has 32 divisors (see below), whose sum is σ = 1969920. Its totient is φ = 245880.

The previous prime is 811997. The next prime is 812011. The reversal of 811998 is 899118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90 + ... + 1277.

It is an arithmetic number, because the mean of its divisors is an integer number (61560).

2⁸¹¹⁹⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (984960).

811998 is an abundant number, since it is smaller than the sum of its proper divisors (1157922).

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

811998 is a wasteful number, since it uses less digits than its factorization.

811998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389 (or 1383 counting only the distinct ones).

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

The square root of 811998 is about 901.1093163429. The cubic root of 811998 is about 93.2935573140.

The spelling of 811998 in words is "eight hundred eleven thousand, nine hundred ninety-eight".