861198 has 32 divisors (see below), whose sum is σ = 1895712. Its totient is φ = 259200.

The previous prime is 861191. The next prime is 861199. The reversal of 861198 is 891168.

861198 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861191) 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, 4668 + ... + 4848.

It is an arithmetic number, because the mean of its divisors is an integer number (59241).

2⁸⁶¹¹⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (947856).

861198 is an abundant number, since it is smaller than the sum of its proper divisors (1034514).

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

861198 is a wasteful number, since it uses less digits than its factorization.

861198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260.

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

The square root of 861198 is about 928.0075430728. The cubic root of 861198 is about 95.1409910188.

The spelling of 861198 in words is "eight hundred sixty-one thousand, one hundred ninety-eight".