861798 has 48 divisors (see below), whose sum is σ = 2121984. Its totient is φ = 228480.

The previous prime is 861797. The next prime is 861799. The reversal of 861798 is 897168.

861798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (861797) and next prime (861799).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 861798.

It is not an unprimeable number, because it can be changed into a prime (861797) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12103 + ... + 12173.

It is an arithmetic number, because the mean of its divisors is an integer number (44208).

2⁸⁶¹⁷⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1060992).

861798 is an abundant number, since it is smaller than the sum of its proper divisors (1260186).

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

861798 is a wasteful number, since it uses less digits than its factorization.

861798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 100 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 861798 is about 928.3307600204. The cubic root of 861798 is about 95.1630809225.

The spelling of 861798 in words is "eight hundred sixty-one thousand, seven hundred ninety-eight".